A category name extraction device includes a specifying means configured to specify a word contained in a plurality of item information respectively belonging to a plurality of categories in parallel structure, qualifying or being qualified by a name of a category where each item information belongs, and being in common to a plurality of item information belonging to a plurality of different categories, as a reference word, an extraction means configured to extract a word contained in a phrase contained in item information belonging to any of the plurality of categories, qualifying or being qualified by the reference word, and being different from names of the plurality of categories, as a candidate category name, and an output means configured to output the candidate category name extracted by the extraction means.
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