Display device and method of controlling the display device

A mobile terminal is provided that includes a first display module to receive a touch signal and a second display module configured to be extensible. An image and a pointer may be displayed on the second display module if the second display is ejected from the mobile terminal. The pointer may move according to a drag direction and a drag distance corresponding to the touch signal if a touch signal with directivity is detected from the first display module. A character-input operation and/or a search operation may be performed on the image displayed on the second display module using the first display module.