A method of controlling a digital television, the method includes displaying content or application being executed on a display screen of the digital television, receiving a first signal requesting a menu to be displayed, and displaying the requested menu, overlaid on the display screen, wherein the menu includes a first part and a second part, wherein the first part displays at least one menu item corresponding to previously displayed content or previously executed application, and wherein the second part displays at least one menu item corresponding to content or an application executable in the digital television.