| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system capable of simply and appropriately limiting a terminal capable of joining a communication.SOLUTION: A communication system comprises: a start request information acquisition unit for acquiring start request information which is information for requesting start of a session between first and second terminals and includes designation of presence of session join limitation of a terminal excluding the first and second terminals; a session management unit for establishing a session between the first and second terminals according to the start request information; a join request information acquisition unit for acquiring join request information for requesting a third terminal's join in the already established session between the first and second terminals; and a join determination unit which permits the third terminal to join the established session when the start request information designates no join limitation, and prohibits the third terminal from joining the established session when the start request information designates join limitation. |
