In an image search apparatus, a data manager responds to an instruction for a first search condition issued via a user interface to manage data of a target model acquired from a database and generates an image to be displayed on a user interface. A determination processor responds to an instruction for a second search condition issued by positioning a pointer on the whole model image to compare a closed area defined by the specified position with boundary information of each part image, retrieves candidate part images, and prioritizes the candidate part images in order of increasing area calculated based on the boundary information. A parts selection processor displays the retrieved candidate part images on the user interface according to the order of increasing area in response to an instruction for a third search condition for choosing a target part image from among the candidate part images.