SEARCH DEVICE, SEARCH METHOD AND SEARCH PROGRAM

A search device includes: a module feature amount calculation unit which extracts a keyword group from each of a plurality of modules obtained by dividing a document and which calculates data characterizing the keyword group as a feature amount for the module; a search feature amount calculation unit which receives a search request using a natural sentence so as to extract a keyword group from the natural sentence and which calculates data characterizing the keyword group as a feature amount for the search request; and a module selection unit which selects, based on the degrees of matching between the feature amounts for the individual modules and the feature amount for the search request, a module corresponding to the search request as the result of a search.