A control method of an information terminal includes sensing specification information indicating a region of interest in a medical image, receiving from a case retrieval system one or more similar medical images each having a prescribed degree of similarity with a feature quantity of the region of interest indicated by the specification information in accordance with the region of interest, and displaying the medical image that is managed by a medical information management system in a first display region that is displayed on the display and displaying thumbnail views of a plurality of similar medical images received from the case retrieval system in a second display region that differs from the first display region.
