| 摘要 |
PROBLEM TO BE SOLVED: To prevent a retrieval keyword for certain information from being acquired from the other information. SOLUTION: A retrieval server includes an ADB in which a first keyword, a second keyword and additional information are stored in association with one another; and a retrieval part for receiving the second keyword from the retrieval terminal, retrieving the ADB using the second keyword, reading the additional information and the first keyword, outputting it to the retrieval terminal, receiving the first keyword from the retrieval terminal, acquiring the first content corresponding to the first keyword, and outputting it to the retrieval terminal. COPYRIGHT: (C)2009,JPO&INPIT
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