A printing apparatus creates and prints an order sheet on which a list of image data is placed. By filling in marking fields on the order sheet a user can select image data for transmission. Once the order sheet has been scanned by the scanner, the printing apparatus creates an e-mail having attached to it the image data selected by the user, and sends this to a computer or the like via a mail server. It is possible in this way to easily select image data for transmission through a prescribed communications network.