A store design assistance device and a store design assistance method for assisting in various designs of a real store according to a trend of consumers who are targets of a real store are provided. A store design assistance device includes a database, an attribute information acquisition unit that acquires second consumer attribute information indicating an attribute of a second consumer at a real store, a history information acquisition unit that acquires information on an action history of the first consumer having the first consumer attribute information matching the second consumer attribute information from the database, and an output unit that outputs information on design assistance of the real store on the basis of the information on the action history acquired by the history information acquisition unit.
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