Techniques for providing an ID image on a print medium are disclosed. Commodity information on a commodity settled in a store is received from a store terminal installed at the store. ID images, defining ID information in a frequency domain and accompanied by attribute information that is used by the store terminal to decide whether or not each of the stored ID images is to be printed, are stored. A correspondence between the commodity information and the stored ID images is also stored. ID images corresponding to the received commodity information from the stored ID images using the stored correspondence are then retrieved. An attribute list, which registers the attribute information of the stored ID images that is used by the store terminal to decide whether or not each of the stored ID images is to be printed, is stored. Thereafter, only the retrieved ID images which have been decided to be printed based on the stored attribute list are transmitted. The transmitted ID images are then printed on a print medium.