Method and system for efficient group session management

PURPOSE: A method for effectively managing a group communication session and a system therefor are provided to preset a media channel with a media repeater when initializing communication terminals. CONSTITUTION: A group session management device(303) requests a media repeater(304) to set a media channel with communication terminals(101-103) by an invite request of the communication terminals(101-103). The media repeater(304) responds to the request. If the media channel is successfully assigned, a '200 OK message' is transmitted to the communication terminals(101-103). If the communication terminals transmit an ACK(Acknowledgement) message, the media channel is completely set.