1. An image search apparatus that identifies an image of an imaged object by searching a database, comprising: a database which has feature information stored in association with object sample images, object names, and sample images of another portion of the object; an extracting section which extracts 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; a first display control section which causes 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 a second display control section which changes the plurality of candidate images displayed on the display section to corresponding sample images of the other portion of the object and causes the corresponding sample images to be displayed on the display section.