1. An image search apparatus that identifies an image of an imaged object by searching a database which has feature information stored in association with object sample images, object names, and object another portion sample images, the image search apparatus comprising: a CPU which is configured to: extract a plurality of object sample images having a high similarity to the image of the imaged object as candidate images by comparing feature information of the image of the imaged object and the feature information stored in the database; cause the image of the imaged object, the candidate images that are the plurality of extracted object sample images, and object names corresponding to the candidate images to be arranged and displayed on a display section; and change the plurality of candidate images displayed on the display section to corresponding object another portion sample images and cause the corresponding object another portion sample images to be displayed on the display section.