Disclosed are a smart device capable of multi-tasking control, capable of controlling a multi-tasking program while a main program screen is viewed, and a control method therefor. The smart device capable of multi-tasking control and the control method therefor can control a second program without being disturbed by the use of a first application and have the advantages of easily controlling a second application due to a wide input range since a user uses the entire screen, and enabling the user to control two applications, as necessary, since the overlay state of a first screen can be changed using only a simple input signal.