A display apparatus and a controlling method thereof are provided. The controlling method of a display apparatus includes displaying a mode conversion user interface (UI) that provides a guideline to enter a motion task mode; recognizing a first motion that corresponds to the guideline; entering the motion task mode that enables a second motion to control a function of the display apparatus in response to the first motion being recognized while the guideline is displayed on the display apparatus; and displaying a motion task UI to perform the motion task mode.