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An image communication system including electronic-mail apparatuses each having a function to add image-file processing information to an image file attached to an electronic mail. The image processing capability of each apparatus is examined in advance. In a transmitting-side apparatus, an image fi

An image communication system including electronic-mail apparatuses each having a function to add image-file processing information to an image file attached to an electronic mail. The image processing capability of each apparatus is examined in advance. In a transmitting-side apparatus, an image file is generated in accordance with the capability, and an electronic mail, to which the image file is attached, is transmitted to a receiving-side apparatus. Further, if the image file attached to the transmitted electronic mail cannot be processed by the receiving-side apparatus, the receiving-side apparatus notifies the transmitting-side apparatus of clarified cause of processing failure, further, transmits its image-file processing capability and the unprocessed transmitted electronic mail to the transmitting-side apparatus. Thus, efficient image-file transmission/reception can be performed.

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1. An image communication system including at least a first communication terminal and a second communication terminal,said first communication terminal comprising:first electronic-mail transmission means for transmitting a first electronic mail with a capability request to inquire into a processing

1. An image communication system including at least a first communication terminal and a second communication terminal,said first communication terminal comprising:first electronic-mail transmission means for transmitting a first electronic mail with a capability request to inquire into a processing capability of said second communication terminal;first electronic-mail reception means for receiving a second electronic mail from said second communication terminal;discrimination means for discriminating whether or not the second electronic mail is an electronic mail with a capability response corresponding to the capability request;a destination capability storage means for storing destination capability information corresponding to a destination address based on the capability response included in the second electronic mail;reading means for reading an image; andconversion means for converting the image read by said reading means to an image file based on the destination capability information stored by said destination capability storage means,wherein said first electronic-mail transmission means transmits a third electronic mail to which the image file is attached, to said second communication terminal,and said second communication terminal comprising:second electronic-mail reception means for receiving the first electronic mail with the capability request from said first electronic-mail transmission means; andsecond electronic-mail transmission means for transmitting the second electronic mail with the capability response corresponding to the capability request,wherein said second electronic-mail reception means receives the third electronic mail to which the image file is attached. 2. The image communication system according to claim 1, wherein the capability response is included in an image file attached to the second electronic mail. 3. The image communication system according to claim 1, wherein the capability response includes information on image-file processing capability. 4. The image communication system according to claim 1, wherein said second communication terminal comprises image processing means for processing the image file which is attached to the third electronic mail received by said second electronic-mail reception means, in accordance with the capability. 5. The image communication system according to claim 1, wherein if said second communication terminal receives the first electronic mail with the capability request from said first communication terminal, said second electronic-mail transmission means automatically transmits the second electronic mail with the capability response to said first communication terminal. 6. The image communication system according to claim 4, wherein said second electronic-mail transmission means further transmit a fourth electronic mail with information notifying a result of processing on the received image file. 7. The image communication system according to claim 6, wherein said third electronic-mail includes capability information of said first communication terminal. 8. An electronic-mail apparatus comprising:electronic-mail transmission means for transmitting an electronic mail with a capability request to inquire into a processing capability of a destination apparatus;electronic-mail reception means for receiving an electronic mail from an electronic-mail server;discrimination means for discriminating whether or not the electronic mail received by said electronic-mail reception means is an electronic mail with a capability response corresponding to the capability request;destination capability storage means for storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail;reading means for reading an image; andconversion means for converting the image read by said reading means to an image file based on the destination capability information stored by said destination capabi lity storage means,wherein said electronic-mail transmission means further transmits an electronic mail to which the image file is attached, to the destination apparatus. 9. The electronic-mail apparatus according to claim 1, said electronic-mail transmitting means further transmits an electronic mail with process-result information notifying the result of processing on the received image file by said processing means. 10. The electronic-mail apparatus according to claim 9, wherein said electronic-mail transmitting means further transmits an electronic mail with both capability information on image processing capability of said apparatus and the process-result information. 11. An electronic-mail apparatus comprising:electronic-mail reception means for receiving an electronic mail with a capability request from a transmitting-side apparatus;discrimination means for discriminating whether or not the electronic mail received by electronic-mail reception means is an electronic mail with a capability request;electronic-mail transmitting means for transmitting an electronic mail with a capability response corresponding to the capability request,wherein the electronic mail with the capability response includes information for identifying the capability request;destination capability storage means for storing destination capability information corresponding to a destination address based on the capability request included in the received electronic-mail; andelectronic-mail attachment reception means for receiving an electronic-mail attachment, said electronic-mail attachment formatted by the transmitting-side apparatus according to capability information from the capability response. 12. The electronic-mail apparatus according to claim 9, wherein the capability response information is added to a comment-adding field in format data area of an image file attached to the electronic mail. 13. The electronic-mail apparatus according to claim 9, wherein the capability response includes information on image processing capability of said apparatus. 14. The electronic-mail apparatus according to claim 9, wherein if said electronic-mail reception means receives the electronic mail with the capability request, said electronic-mail transmission means automatically returns an electronic mail accompanied by information on capability of said apparatus as the capability response. 15. The electronic-mail apparatus according to claim 9, further comprising:said electronic-mail reception means for receiving an electronic mail to which an image file is attached;image processing means for processing the received image file. 16. A communication method for performing transmission/reception of an electronic mail between first and second communication terminals, comprising:a capability request transmission step of transmitting an electronic mail with the capability request from said first communication terminal to said second communication terminal;a capability request reception step of receiving the electronic mail with the capability request from said first communication terminal in said second communication terminal;a capability response transmission step of transmitting an electronic mail with a capability response, corresponding to the capability request, from said second communication terminal to said first communication terminal, the electronic mail with a capability response including information for identifying the capability request;an electronic mail reception step of receiving an electronic mail from said second communication terminal in said first communication terminal;discrimination step of discriminating whether or not the electronic mail received at said electronic-mail reception step is the electronic mail with the capability response corresponding to the capability request;a destination capability storage step, in said first communication terminal for storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail;an image-file generation step, in said first communication terminal, of generating an image file in a format based on the destination capability information stored by said destination capability storage means; andan image-file transmission step for transmitting an electronic mail, to which the generated image file is attached, from said first communication terminal to said second communication terminal. 17. A computer-readable memory containing a control program for performing transmission/reception of an electronic mail, said program including:capability request transmission process procedure codes for transmitting an electronic mail with a capability request to a destination apparatus;an electronic-mail reception process procedure codes for receiving an electronic mail;discrimination process procedure codes for discriminating whether or not the electronic mail received by said electronic-mail reception process is the electronic mail with the capability response corresponding to the capability request;destination capability storage process procedure codes for storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail;image-file generation process procedure codes for generating an image file in a format based on the destination capability information stored by said destination capability storage means; andimage-file transmission process procedure codes for transmitting an electronic mail, to which the generated image file is attached, to the destination apparatus. 18. An electronic-mail apparatus comprising:electronic-mail transmission means for transmitting an electronic mail with a capability request to inquire a capability of a destination apparatus;electronic-mail reception means for receiving an electronic mail from the destination apparatus;discrimination means for discriminating whether or not the electronic mail received by said electronic-mail reception means is the electronic mail with a capability response corresponding to the capability request;destination capability storage means for storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail; andgeneration means for generating an image file in a format based on the destination capability information stored by said destination capability storage means and extracted from the received electronic mail, wherein said electronic-mail transmission means transmits an electronic mail, to which the generated image file is attached, to the destination apparatus. 19. An electronic-mail apparatus comprising:electronic-mail transmission means for transmitting an electronic mail with a capability request to inquire a capability of a destination apparatus;electronic-mail reception means for receiving an electronic mail from the destination apparatus;discrimination means for discriminating whether or not the electronic mail received by said electronic-mail reception means is the electronic mail with a capability response corresponding to the capability request;destination capability storage means for storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail; andconversion means for converting a format of an image file in accordance with the destination capability information stored by said destination capability storage means and extracted from the received electronic mail, before transmitting the image file to the destination apparatus; andwherein said electronic-mail transmission means transmits an electronic mail, to which the image file is attached, to the destination apparatus. 20. A communication method comprising:a first electronic-mail transmission step of transmitting an electronic mail with a capability request to inquire a capability of a destination apparatus;an electronic-mail reception step of receiving an electronic mail from the destination apparatus;a discrimination step of discriminating whether or not the electronic mail received by said electronic-mail reception step is the electronic mail with a capability response corresponding to the capability request;a destination capability storage step of storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail; anda generation step of generating an image file in a format based on the destination capability information stored in said destination capability storage step and extracted from the received electronic mail; anda second electronic-mail transmission step of transmitting an electronic mail, to which the generated image file is attached, to the destination apparatus. 21. A communication method comprising:a first electronic-mail transmission step of transmitting an electronic mail with a capability request to inquire a capability of a destination apparatus;an electronic-mail reception step of receiving an electronic mail from the destination apparatus;a discrimination step of discriminating whether or not the electronic mail received by said electronic-mail reception step is the electronic mail with a capability response corresponding to the capability request;a destination capability storage step of storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail; anda conversion step of converting a format of an image file in accordance with the destination capability information stored in the destination capability storage step and extracted from the received electronic mail, before transmitting the image file to the destination apparatus; anda second electronic-mail transmission step of transmitting an electronic mail, to which the image file is attached, to the destination apparatus. 22. A computer-readable memory containing a control program for an electronic-mail apparatus, said program including:electronic-mail transmission process procedure codes for transmitting an electronic mail with a capability request to inquire a capability of a destination apparatus;electronic-mail reception process procedure codes for receiving an electronic mail from the destination apparatus;discrimination process procedure codes for discriminating whether or not the electronic mail received by said electronic-mail reception step is the electronic mail with a capability response corresponding to the capability request;destination capability storage process procedure codes for storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail; andgeneration process procedure codes for generating an image file in a format based on the destination capability information stored by said destination capability storage process and extracted from the received electronic mail, wherein by said electronic-mail transmission process procedure codes an electronic mail, to which the generated image file is attached, is transmitted to the destination apparatus. 23. A computer-readable memory containing a control program for an electronic-mail apparatus, said program including:electronic-mail transmission process procedure codes for transmitting an electronic mail with a capability request to inquire a capability of a destination apparatus;electronic-mail reception process procedure codes for receiving an electronic mail from the destination apparatus;discrimination process procedure codes for discriminating whether or not the electronic mail received by said electronic-mail reception process procedure is the electronic mail with a capability response corresponding to the capability request; anddestination capability storage process procedure co des for storing destination capability information corresponding to a destination address based on the capability response included in the received electronic mail; andconversion process procedure codes for converting a format of an image file in accordance with the destination capability information stored by said destination capability storage process and extracted from the received electronic mail, before transmitting the image file to the destination apparatus, wherein by said electronic-mail transmission process procedure codes an electronic mail, to which the image file is attached, is transmitted to the destination apparatus.