In a digital multi-function peripheral, a QR code generation section generates image data of a QR code on the basis of first data for security of obtained image data. The transmission method includes determining a posture of the mobile terminal in an active state, updating a preset reference power by adding a power gain determined according to the posture of the mobile terminal, and transmitting a transmit signal amplified according to the updated reference power. The corrugated web is cut and folded to create the honeycomb core. The authentication information depends upon contents of the authentication information generation factor and the held information, and not upon the information volume of the held information.