1. A search supporting system comprising: a memory that stores instructions; and a computer that is configured to execute the instructions stored in the memory to: receive an input image, extract a contour of the input image and generate image data of the contour, determine a product type of a target based on the image data of the contour, search a database, based on the type of the target and on preference information of a user, to select a first target image that best coincides with the contour by comparing image characteristics information that represents characteristics of an image of the image data of the contour with image characteristics information that represents characteristics of the first target image that is included in the database, the preference information being accumulated in the database for each of a plurality of product types, and output, together with the first target image, a second target image on a display, the second target image being different from the first target image and being from the database.