In a playback device having a switching function for switching between a planar video playback mode and a stereoscopic video playback mode, inconsistencies between the left eye image and the right eye image occur when switching. Specifically, when the device is switched from the planar video playback mode to the stereoscopic video playback mode, a rendering request from Graphics#drawImage is disabled and after copying the contents stored on the left eye graphics plane to the right eye graphics plane, the graphics display output system is switched and the prohibition of the rendering request from Graphics#drawImage is lifted, thereby preventing inconsistencies between the left eye image and the right eye image.