Communication system and upload method

A method implemented by a communication system that includes a plurality of communication terminals configured to transmit communication information and a communication controller, the method comprising:

• at each communication terminal,
• generating log information on communication between the communication terminals,
• storing the generated log information, and
• uploading log information that is capable of being uploaded depending on a communication line band used for the communication information,
• wherein the communication controller includes a communication management server configured to control transmission of the communication information and a log upload server, wherein the method further includes, at the communication controller, distributing the log information uploaded by each communication terminal to the log upload server,
• wherein
• the method further includes
• determining, at each communication terminal, from among pieces of log information, a piece of log information that is capable of being uploaded without congesting a communication line band used for communication,
• uploading, by each communication terminal, the piece of determined log information determined by the determiner,
• performing control by the communication controller such that
• transmission information is transmitted to the communication management server, which is configured to manage communication between the communication terminals at multiple sites, when the transmission information is the communication information, and
• transmission information is transmitted to the log upload server when the transmission information is the log information,
• wherein the method further includes
• accumulating the log information,
• performing an automatic upload of the log information at a predetermined timing, and
• suspending the automatic upload during ongoing transmission of the communication information,
• wherein when it has been determined that communication between the communication terminals has ended after determining that there is no ongoing transmission between the communication terminals, the predetermined timing of the automatic upload is a timing after the end of communication between the communication terminals, and
• when it has been determined that a current timing is not a timing after the end of communication between the communication terminals after determining that there is no ongoing transmission between the communication terminals, the predetermined timing of the automatic upload is a timing immediately after the communication terminal logs in the communication controller.