| 摘要 |
An apparatus for retrieving structured documents includes a first categorizing unit configured to categorize components into a first component of typical descriptions and a second component of atypical descriptions, based on statistics information for the components, a second categorizing unit configured to categorize the terms into a first term whose appearance ratio in the first component exceeds a threshold and a second term whose appearance ratio in the first component is not more than the threshold, an extraction unit configured to extract a set of structured documents each having the first component including the first term and the second component from the structured documents, and a ranking unit configured to rank the set of structured documents by a retrieval score calculating based o a relation between the second term and the second component.
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