Providing talk burst authority in group communication system supporting ptt service

[Subject] A specific user is provided with the voice management method of the PTT service system which lodges the master power that a voice managing system can be controlled so that a voice can be managed flexibly. [Solution means] The process in which a PTT server lodges master power in a specific PTT client, By the process in which the above-mentioned PTT server controls other PTT clients by the voice managing system which the PTT client which has the above-mentioned master authority chooses, A PTT server lodges master power in the PTT client which starts a session, and the PTT client which has the above-mentioned master authority offers the voice management method of the PTT service system which controls a voice managing system freely. [Selection figure] Fig. 1