| 摘要 |
A retrieval system retrieves content data stored in a database using an index. The retrieval system includes a first registration unit configured to register a set definition including an index object item indicating a data item serving as the index and an acquisition condition for acquiring the content data from the database; an acquisition unit configured to acquire, when the set definition is registered by the first registration unit, content data included in the set definition, which satisfy the acquisition condition, from the database; and a generation unit configured to extract the index object item included in the set definition, to generate the index, in the content data acquired by the acquisition unit. |
