A printer 1 has a media orientation detection means 65 that detects displacement of the media after conveyance by the conveyance mechanism 63 stops; and a media processing device control unit 100 that controls cutting the media by an automatic paper cutter 60 when the media orientation detection means 65 detects displacement of the media, and controls processing the media by a processing unit when a communication unit receives control data while in a standby mode waiting for detection of media displacement by the media orientation detection means 65.