Disclosed are a display apparatus and a method for controlling same. The display apparatus comprises: a main display unit for displaying a first application group; a sub display unit stored in the display apparatus or exposed therefrom; a sensor unit for sensing whether the display apparatus is rotated; and a control unit, wherein the sub display unit is exposed from the display apparatus to display a second application group, and the control unit controls the main display unit to display a previously configured screen when the sub display is stored, and when the display apparatus is sensed by the sensor unit to have been rotated in the lateral direction within a previously set time by an angle equal to or greater than a previously set angular value, then the control unit can control the main display unit so that the second application group is displayed thereon on a full screen.