user terminal apparatus and control method thereof

The user terminal device is disclosed. The user terminal apparatus includes a main for the display, and the application is configured as a sub display area disposed on at least one region of the back of the user terminal device is extended from one side of the main display area and the main display area arranged in front of the user terminal device running When the touch interaction is detected in the display area to perform a first function of the application, when the touch interaction is detected in the sub display area and a processor to perform a second function of the application.