PROBLEM TO BE SOLVED: To enable a group of arbitrarily selected members to share information when necessary.;SOLUTION: The control of groups by terminals 10 to 12, such as operations on shared objects, member addition and group creation, is reflected to a storage part 2 by a synchronization control information management part 5, an object information management part 6 and an invitation part 7 of the terminals 10 to 12, and a processing content is notified by a message control part 3 to the other terminals forming the group, which reflect it similarly to share information among groups of arbitrarily selected members.;COPYRIGHT: (C)2006,JPO&NCIPI
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