File name data is transmitted from a mobile telephone to a relay server. The file specified by the file name data is read from a database and transmitted to a print service server. In response, a reservation code is transmitted from the print service server to the mobile telephone via the relay server. The user of the mobile telephone goes to a store where a printer has been installed and inputs the reservation code to the printer. The reservation code is transmitted from the printer to the print service server and the file corresponding to the reservation code is transmitted to and printed by the printer. Since the mobile telephone need only transmit the file name data in a case where printing is performed at the printer, data traffic through the mobile telephone is reduced.