Abstract: After mount judging unit (110) transits from a state wherein it decides that earphone (200) is not mounted in an ear to a state wherein it decides that earphone (200) is mounted in the ear, if operating unit (120) accepts a preset unlocking operation, then valid/invalid setter (130) makes a setting for validating operations which will subsequently be accepted by operating unit (120). Valid/invalid setter (130) will keep the setting until mount judging unit (110) decides that earphone (200) is not mounted in the ear. If valid/invalid setter (130) makes the validating setting, controller (140) controls mobile device (100) depending on operations accepted by operating unit (120).

Abstract: After mount judging unit (110) transits from a state wherein it decides that earphone (200) is not mounted in an ear to a state wherein it decides that earphone (200) is mounted in the ear, if operating unit (120) accepts a preset unlocking operation, then valid/invalid setter (130) makes a setting for validating operations which will subsequently be accepted by operating unit (120). Valid/invalid setter (130) will keep the setting until mount judging unit (110) decides that earphone (200) is not mounted in the ear. If valid/invalid setter (130) makes the validating setting, controller (140) controls mobile device (100) depending on operations accepted by operating unit (120).

Abstract: During the abnormal image ejection period, camera output data is set to all “0” to thereby output the data as black image data via the camera data buffer 13 to the moving picture processing unit 15 and the display data buffer 16. The black screen inputted to the moving picture processing unit 15 is encoded. The image data inputted to the display data buffer 16 is not outputted to the display unit 14 during the abnormal frame transmission period; after the normal image is restored, data retained in the display data buffer is continuously transferred at a high speed to the display unit 14 to be overwritten on the latest data, to thereby draw images in which the user does not perceive the abnormal image.