Patent ID: 6898423

Claim:
A group communication system comprising: a plurality of mobile terminals each with a location information, a user-attribute information, and a measured moving state information; and a center component for collecting said location information of said plurality of mobile terminals, wherein said center component includes a group generation means for generating a group of at least one mobile terminal based on a group-area information, a group-attribute information, and a group moving-state information which are specified by said at least one mobile terminal, and a group member management means for monitoring in real time the joining and leaving of said plurality of mobile terminals with said location information, said member-attribute information, and said measured moving state information which correspond to said group-area information, said group-attribute information, and said group moving-state information of said group, respectively, and wherein said group member management means of said center component sends a joining request information of said group to a mobile terminal which satisfies requirements of said group, said mobile terminal answering to said joining request information joins said group as a member, and when said mobile terminal joins or leaves said group, it notifies other mobile terminals of said group.