| 摘要 |
PROBLEM TO BE SOLVED: To construct a database of content data with ease. SOLUTION: In a content sharing system 1: a new client device 20B sends messages to inquire respective existing client devices 20A, 20C, 20D about whether content information are held; when receiving the inquire messages, the existing client devices 20A, 20C, 20D send reply messages showing that they have the content information to the new client device 20B; and when receiving the reply message, the new client device 20B obtains the content information from the existing client devices 20A, 20C, 20D which have sent the reply message. COPYRIGHT: (C)2009,JPO&INPIT
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