| 摘要 |
Metadata corresponding to content data respectively stored in plural communication terminals can be retrieved easily. When any of the following three cases occurs: (a) any of communication terminal A to E is connected to another communication terminal, (b) an addition, a deletion, or a replacement of content data 30 stored in a content data storage 3 is produced, and (c) a communication terminal has received metadata 20 from another communication terminal connected to the communication terminal, a metadata stored 20 in the metadata storage 2 gets updated and the updated metadata 20, if the communication terminal is connected to another upper level communication terminal, gets transmitted to the upper level communication terminal.
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