A camera in which is stored a unique ID is directly or indirectly connected to a printing service site, to which log-in is performed using the ID, whereupon an image from the camera is uploaded to the printing service site, and a printing server distinguishes from the ID which camera the image was uploaded. Printing of the uploaded image can instructed via the printing service site. At the time of printing, when the printing server is calculating the printing charge, the charge is discounted if the image was obtained from a prescribed camera. Alternatively, if the image to be printed was photographed by a camera of a specific manufacturer, a cash-back is issued to the manufacturer in accordance with the number of prints.