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A caller information display system and recording medium in a communication system in which voice communication and data communication can be done between multiple terminals over a network following an Internet protocol, includes a caller information storage unit in which caller information of each

A caller information display system and recording medium in a communication system in which voice communication and data communication can be done between multiple terminals over a network following an Internet protocol, includes a caller information storage unit in which caller information of each local terminal is stored in advance in each terminal, and an input unit that inputs caller information. A display unit displays caller information, and a call circuit unit controls voice communication. The display system also has a caller information transmission and reception control unit which controls transmission and reception of caller information when a call is made or received. When a call is made or received by voice communication with another terminal, caller information is mutually transferred between the calling terminal and the called terminal, and information on the other caller is displayed on the display unit of both the caller terminal and the call recipient terminal simultaneously with the callout or incoming call display.

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1. A caller information display system of a terminal in a communication system that allows voice communication and data communication between multiple terminals via a network by Internet protocol, comprising:a caller information storage unit in which caller information of each local terminal is stor

1. A caller information display system of a terminal in a communication system that allows voice communication and data communication between multiple terminals via a network by Internet protocol, comprising:a caller information storage unit in which caller information of each local terminal is stored in advance in each terminal, an input unit that inputs caller information; a display unit that displays caller information, a call circuit unit that controls voice communication, and a caller information transmission and reception control unit that controls transmission and reception of caller information when a call is made or received, whereinwhen a calling terminal makes a call with a called terminal, caller information is mutually transferred between the calling terminal and the called terminal, and the caller information of the calling terminal is displayed on a display unit of the called terminal, and the caller information of the called terminal is displayed on a display unit of the calling terminal with a callout or incoming call display. 2. The caller information display system of claim 1, further comprising, within the terminal a per-call message storage unit that stores messages one wants to be displayed on said another terminal when a call is made to another terminal, whereina content of said per-call message storage unit is displayed on the display unit of said another terminal, together with said caller information, when said another terminal is called by making a call to ad another terminal. 3. The caller information display system of claim 1, and further comprising within the terminal, an incoming call response message storage unit that stores messages to be transmitted to another terminal when a call arrives from said another terminal whereinwhen a call arrives from another terminal, the content of said incoming call response message storage unit is displayed and an incoming call response message is transmitted to a calling side in accordance with a response instruction input with respect to the display content. 4. The caller information display system of claim 1 comprising, within the terminal, a caller information format setting unit that sets a format of the caller information, whereinwhen caller information is transmitted to another caller, only content information of said format is transmitted and a display of caller information based on said set format is displayed. 5. The caller information display system of claim 4, further comprising a database server that can share caller information with multiple terminals on said network and within the terminal, a server address storage wit that manages the address information of said database server, whereinwhen caller information is updated each terminal transfers the updated caller information to said database server and updates the content of said database server, and each terminal references said database server for needed caller information. 6. The caller information display system of claim 1, and further comprising, within the terminal, a call switching unit that switches another caller, and a holding tone transmission unit that sends a holding tone to the handset, whereinwhen a call arrives from a third terminal at one terminal during a call, caller information of said third terminal as well as a message inquiring whether to do call switching are displayed on the display unit of said one terminal, andaccording to the call switching instruction input, said call switching unit is operated and said another caller is switched, and a holding tone is transmitted from said holding tone transmission unit to the terminal of a person who until then has been said another caller. 7. The caller information display system of a terminal in a communication system that allows voice communication and data communication between multiple terminals via a network by Internet protocol, the caller information display system comprising:a caller information storage unit in which calle r information of each local terminal is stored in advance in each terminal;an input unit that inputs caller information;a display unit that displays caller information;a call circuit unit that controls voice communication; anda caller information transmission and reception control unit that controls transmission and reception of caller information when a call is made or received, whereinwhen a call is made or received by voice communication with another terminal of said multiple terminals, caller information is mutually transferred between a calling terminal and a called terminal, and information of another caller is displayed on a respective display unit of both the caller terminal and a call recipient terminal simultaneously with a callout or incoming call display,the caller information display system further comprising, within the terminal a reception caller information storage unit in which is stored the caller information received from another caller, a time management unit that manages an update time of the received caller information and caller information of the local terminal, and a time exchange unit that before the transmission or reception of caller information performs transmission and reception of the tune of the caller information held in the local terminal, whereincaller information on another caller is held in the local terminal, the caller information from another terminal is obtained and displayed only if the time when received from another terminal is newer than the time held in the local terminal. 8. A caller information display system of a terminal in a communication system that allows communication between terminals via a network by Internet protocol comprising:a caller information storage unit in which caller information is stored in advance in each terminal;a display unit that displays caller information; anda caller information transmission and reception control unit that controls transmission and reception of caller information when a call is made or received, whereinwhen a calling terminal makes a call with a called terminal each caller information is mutually transferred between the calling terminal and the called terminal, and the caller information of the calling terminal is displayed on a display unit of the called terminal, and the caller information of the called terminal is displayed on a display unit of the calling terminal.