To eliminate ambiguity of an inputted query in search for a target document, an image with annotation and information of Web and the like for greatly improving operability of a user and effectively searching objective information.

This information search device is provided with a storage device 2 storing search objective information, an input device 3 inputting a query, and a central processing unit 1. The central processing unit 1 performs language analysis processing for a query character string, morpheme comparison processing for comparing a language analysis result of the query with that of the stored information in the storage device 2 to determine presence/absence of a matching morpheme, and display control processing for displaying a single or a plurality of information names and the like containing the matching morpheme in a display device 4.