| 摘要 |
PROBLEM TO BE SOLVED: To determine whether or not a communication source user starts communication according to surrounding environments of an opposite terminal, in a communication system which uses a communication network.SOLUTION: A communication system has a position information server which manages information leakage risk presence/absence information and position information for each call terminal. The position information server momentarily notifies a call management server of the information leakage risk presence/absence information and the latest position information for each communication terminal. The call management server notifies a communication source call terminal of the information leakage risk presence/absence information, the latest position information, and a terminal name for each communication destination terminal, in accordance with an address list request of the communication source call terminal. The communication source call terminal displays the position information and the terminal name for each communication destination call terminal, and a display method for the position information is changed in accordance with the information leakage risk presence/absence information. |
