When USB communication between a host computer and media processing device is interrupted while processing media, sending useless read data to the host computer is prevented. A control method for a media processing device 1 that is connected by a USB cable to a host computer 30, reads information continuously from a plurality of slips S according to instructions from the host computer 30, and sends the read information to the host computer 30 has steps of monitoring the communication state between the host computer 30 and the media processing device 1, interrupting the continuous reading process by executing a software reset process when communication becomes disabled while the continuous reading process is running (step S25 returns Yes), and deleting read data that has not been sent to the host computer 30 (step S26).