A device configured to execute a plurality of operating systems, including a display configured to display a screen corresponding to an active operating system among the plurality of operating systems; and a controller configured to control the display to display an operation screen of the active operating system on the display when the active operating system is activated and to display an operation screen of a secondary operating system on the display when the device receives a user input according to a predetermined interface for switching from the active operating system to the secondary operating system.