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In data communication between a terminal equipment connected to a first network and a second network and a server terminal equipment via an interconnecting installation, there are provided a first communication controller in which data communication control is performed on the terminal equipment via

In data communication between a terminal equipment connected to a first network and a second network and a server terminal equipment via an interconnecting installation, there are provided a first communication controller in which data communication control is performed on the terminal equipment via the first network by a message group for functions of data transfer, transmission acknowledgment, flow control, and the like, and a second communication controller in which the data communication control is performed on the interconnecting installation with the terminal equipment via the first network by the message group, and the data communication control is performed with TCP module of the server terminal equipment according to TCP. By this, data communication efficiency is enhanced in a communication environment for communicating a communication terminal equipment on a cable network through a radio line or another access link.

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1. A data communication method for transmitting/receiving desired data between a terminal equipment and at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, said method comprising the st

1. A data communication method for transmitting/receiving desired data between a terminal equipment and at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, said method comprising the steps of:preparing a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication; andexchanging said message between said terminal equipment and said interconnecting installation to transmit and receive the desired data, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a passive opening message for requesting a passive opening of said connection;an active opening message for requesting an active opening of said connection;an establishment message for notifying connection establishment for said connection passive opening request or said connection active opening request made in the past;a close message for requesting close of said connection; anda reply message which is reply notification to said received message, andwherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.2. A data communication method for transmitting/receiving desired data between a terminal equipment and at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, said method comprising the steps of:preparing a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication; andexchanging said message between said terminal equipment and said interconnecting installation to transmit and receive the desired data, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a data message which is the desired data transmitted/received between said terminal equipment and said interconnecting installation;an acknowledgment message for use in transmission acknowledgment of said data message;a reception disable message for use in flow control of said data message, and for requesting transmission discontinuation of said data message; anda reception enable message for use in the flow control of said data message, and for requesting transmission resuming of the discontinued data message, and wherein each of said messages includes connection identifier information for identifying connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.3. A terminal equipment for transmitting/receiving desired data with at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, said terminal equipment comprising:a communication controller for exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication so that a desired data is transmitted to and received from said interconnecting installation, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a passive opening message for requesting a passive opening of said connection;an active opening message for requesting an active opening of said connection;an establishment message for notifying connection establishment for said connection passive opening request or said connection active opening request made in the past;a close message for requesting close of said connection; anda reply message which is reply notification to said received message, andwherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.4. A terminal equipment for transmitting/receiving desired data with at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, said terminal equipment comprising:a communication controller for exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication, so that a desired data is transmitted to and received from said interconnecting installation, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a data message which is the desired data transmitted/received between said terminal equipment and said interconnecting installation;an acknowledgment message for use in transmission acknowledgment of said data message;a reception disable message for use in flow control of said data message, and for requesting transmission discontinuation of said data message; anda reception enable message for use in the flow control of said data message, and for requesting transmission resuming of the discontinued data message, and wherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.5. An interconnecting installation for relaying data communication between a terminal equipment and at least one server terminal equipment, and performing data communication with said server terminal equipment under TCP/IP protocol said interconnecting installation comprising:a communication controller for exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication so that a desired data is transmitted to and received from said terminal equipment, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a passive opening message for requesting a passive opening of said connection;an active opening message for requesting an active opening of said connection;an establishment message for notifying connection establishment for said connection passive opening request or said connection active opening request made in the past;a close message for requesting close of said connection; anda reply message which is reply notification to said received message, andwherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.6. An interconnecting installation for relaying data communication between a terminal equipment and at least one server terminal equipment, and performing data communication with said server terminal equipment under TCP/IP protocol, said interconnecting installation comprising:a communication controller for exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication, so that a desired data is transmitted to and received from said terminal equipment, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a data message which is the desired data transmitted/received between said terminal equipment and said interconnecting installation;an acknowledgment message for use in transmission acknowledgment of said data message;a reception disable message for use in flow control of said data message, and for requesting transmission discontinuation of said data message; anda reception enable message for use in the flow control of said data message, and for requesting transmission resuming of the discontinued data message, and wherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.7. A data communication system for transmitting/receiving desired data between a terminal equipment and at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, wherein said terminal equipment comprises:a first communication controller for exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication, so that a desired data is transmitted and received from said interconnecting installation, andwherein said interconnecting installation comprises:a second communication controller for exchanging the message provided with the header, so that a desired data is transmitted to and received from said terminal equipment, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a passive opening message for requesting a passive opening of said connection;an active opening message for requesting an active opening of said connection;an establishment message for notifying connection establishment for said connection passive opening request or said connection active opening request made in the past;a close message for requesting close of said connection; anda reply message which is reply notification to said received message, andwherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.8. A data communication system for transmitting/receiving desired data between a terminal equipment and at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, wherein said terminal equipment comprises:a first communication controller for exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication, so that a desired data is transmitted and received from said interconnecting installation, andwherein said interconnecting installation comprises:a second communication controller for exchanging the message provided with the header, so that a desired data is transmitted to and received from said terminal equipment, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a data message which is the desired data transmitted/received between said terminal equipment and said interconnecting installation;an acknowledgment message for use in transmission acknowledgment of said data message;a reception disable message for use in flow control of said data message, and for requesting transmission discontinuation of said data message; anda reception enable message for use in the flow control of said data message, and for requesting transmission resuming of the discontinued data message, and wherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said interconnecting installation.9. A recording medium for recording a program for allowing a computer to transmit/receive desired data with at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, wherein said recording medium records such a program as exchanging a message provided with a header formatted to as to dedicatedly comprise information necessary for a particular control required to perform the data communication is recorded, so that a desired data is transmitted to and received from said interconnecting installation, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a passive opening message for requesting a passive opening of said connection;an active opening message for requesting an active opening of said connection;an establishment message for notifying connection establishment for said connection passive opening request or said connection active opening request made in the past;a close message for requesting close of said connection; anda reply message which is reply notification to said received message, andwherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said computer and said interconnecting installation.10. A recording medium for recording a program for allowing a computer to transmit/receive desired data with at least one server terminal equipment via an interconnecting installation for performing data communication with the server terminal equipment under TCP/IP protocol, wherein said recording medium records such a program as exchanging a message provided with a header formatted to as to dedicatedly comprise information necessary for a particular control required to perform the data communication is recorded, so that a desired data is transmitted to and received from said interconnecting installation, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a data message which is the desired data transmitted/received between said computer and said interconnecting installation;an acknowledgment message for use in transmission acknowledgment of said data message;a reception disable message for use in flow control of said data message, and for requesting transmission discontinuation of said data message; anda reception enable message for use in the flow control of said data message, and for requesting transmission resuming of the discontinued data message, and wherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said computer and said interconnecting installation.11. A recording medium for recording a program for relaying data communication between a terminal equipment and at least one server terminal equipment, and allowing a computer to perform the data communication with said server terminal equipment under TCP/IP protocol, wherein said recording medium records such a program as exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication, so that a desired data is transmitted to and received from said terminal equipment, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a passive opening message for requesting a passive opening of said connection;an active opening message for requesting an active opening of said connection;an establishment message for notifying connection establishment for said connection passive opening request or said connection active opening request made in the past;a close message for requesting close of said connection; anda reply message which is reply notification to said received message, andwherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said computer.12. A recording medium for recording a program for relaying data communication between a terminal equipment and at least one server terminal equipment, and allowing a computer to perform the data communication with said server terminal equipment under TCP/IP protocol, wherein said recording medium records such a program as exchanging a message provided with a header formatted so as to dedicatedly comprise information necessary for a particular control required to perform the data communication, so that a desired data is transmitted to and received from said terminal equipment, wherein said header is formatted such that said message comprises a message selected from the group consisting of:a data message which is the desired data transmitted/received between said terminal equipment and said computer;an acknowledgment message for use in transmission acknowledgment of said data message;a reception disable message for use in flow control of said data message, and for requesting transmission discontinuation of said data message; anda reception enable message for use in the flow control of said data message, and for requesting transmission resuming of the discontinued data message, andwherein each of said messages includes connection identifier information for identifying connection which is a virtual channel set between said terminal equipment and said computer.