| 摘要 |
PROBLEM TO BE SOLVED: To allow information shared among users having the same taste. SOLUTION: A Web server stores a latest file number showing latest information provided to the user belonging to a group grouped with the users having the same taste associatively to the group, and acquires a file number uniquely allocated to the information provided to each user by poling executed from all the users receiving the access when receiving the access from the users belonging to the stored group. The Web server decides whether the file number acquired in each user is the latest file number provided to the group to which the user belongs or not in reference to a user group storage means, and provides the latest information allocated with the latest file number to the user having the acquired file number that is not the latest file number. COPYRIGHT: (C)2009,JPO&INPIT
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