In order to reliably back up data in the event of a disaster, an MFP includes a data communication control unit for communicating with a backup device connected to LAN or the Internet, a warning reception unit acquiring a disaster occurrence signal output by a disaster warning detection unit, a data storage unit storing data, and a transmission control unit controlling the data communication control unit to transmit to the backup device data selected beforehand by a priority storing unit from the data stored in the data storage unit, when the disaster occurrence signal is received by the warning reception unit.