| 摘要 |
Enables retrieving document data appropriately reflecting content of a retrieval statement and detecting problems in sequentially added document data. A retrieval system retrieves document data having content specified by an inputted retrieval statement among a plurality of document data, including: document database storing the plurality of document data, concept database storing a plurality of concepts using a hierarchical structure; document data concept extraction extracting document concepts based on keywords contained in respective document data, the concepts being concepts corresponding to the document data; retrieval statement concept extraction extracting a retrieval statement concept based on a keyword contained in the retrieval statement; a concept retrieving section retrieving concepts wherein the retrieval statement concept is a higher or lower layer of the document concept among the plurality of document data, retrieval result output section outputting document data retrieved, as the document data containing content specified by the retrieval statement.
|
