| 摘要 |
PROBLEM TO BE SOLVED: To effectively assist a further narrowing-down processing for retrieval results. SOLUTION: This device is provided with an input part 11 which inputs a set of retrieval keys, a document retrieval part 12 which performs retrieval according to the set of retrieval keys inputted from the input part 11 and outputs a set of documents, a retrieval key output part 13 which inputs the set of retrieval keys and the output of the document retrieval part 12 and outputs a new set of retrieval keys, and a display part 14 for displaying the process, result, etc., of retrieval.
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