Provided are a task switching method capable of rapidly and easily accessing a task of interest by using a button that may receive a touch-based input and a device for executing the task switching method. The device includes a button configured to receive an input; a display configured to display task switching screens; and a processor configured to set a task switching mode in response to the button receiving a first input, and control the display to display the task switching screens in response to the button receiving a second input.