| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication terminal, a server device, a communication system and a group communication method that can delete the data used for group communication. SOLUTION: Confidential PTT communication for deleting the data used for PTT communication is executed, after the elapse of predetermined validity period, after the PTT communication and each of a communication terminal of a sponsor, a PTT server and a communication terminal of a member automatically deletes the data used for the secret PTT communication, after the elapse of a predetermined validity period of PTT communication, after the termination of the confidential PTT communication. COPYRIGHT: (C)2008,JPO&INPIT
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