An image acquiring unit acquires an image of a sheet on which a medium that presents an identification image, including identification information is to be placed, the sheet including a user image that is presented by a user. A first identification-information acquiring unit acquires the identification information from the image acquired by the image acquiring unit. An image extracting unit extracts the user image from the image acquired by the image acquiring unit. A second identification-information acquiring unit acquires the identification information from the medium alone. A first storage unit stores the user image in association with the identification information. A managing unit acquires, from the first storage unit, a user image such that the identification information associated with the user image matches the identification information acquired by the second identification-information acquiring unit, among the user images that are stored in the first storage unit.