A hybrid device that can perform plural operations can switch quickly between operating modes. The hybrid device can perform plural processes on a processed medium based on commands sent from a host computer 200. If a scan command instructing a optical reader 110, which is another process unit, to scan the processed medium is received while executing a print command for a printing process on the medium, the control unit 70 sets the scan command to a command execution standby state, finishes executing the print command, and after the print command is completed executes the scan command queued in the command execution standby state.