Mobile electronic device, accessory device therefor, and electronic apparatus having the accessory device

The electronic device with a mobile electronic device, the accessory device therefor, and that the accessory device is disclosed. Mobile electronic device, a display unit having a display screen; Cover recognition section that covers the display screen Covering the recognized identification information of a cover; When the cover and the identification information is received by the driving program corresponding to the identification information may include a control unit for displaying on the screen displaying a user interface screen corresponding to the cover.