CONTENTS SERVER, AND CONTENTS SERVICE SYSTEM

A communication system or a contents server for suitably storing and providing media contents from a group user in PoC services, conference services or the like. The contents server comprises a recording unit for recording, for each predetermined group, the media information from a plurality of users having participated in the group and being in a communicable state, a detecting unit for detecting the individual communicable/incommunicable states of the participant users for every predetermined time periods, and a deleting unit for deleting, when the detecting unit detects that the states of the participant users are all in the communicable state, the confirmed media information recorded in the recording unit on or before the detection.