An electronic device comprising: a display unit; an input unit; at least one hardware button; and a controller operatively coupled with the display unit and the input unit, the controller is configured to: display a main screen, wherein displaying the main screen comprises displaying a first page within the main screen among a plurality of pages, wherein each page comprises at least one icon and at least one button (313,316); while displaying the first page within the main screen, receive a first touch input on a designated button of the at least one button displayed on the first page for determining a virtual screen; in response to the reception of the first touch input, display the virtual screen that is a smaller version of the main screen, wherein displaying the virtual screen comprises displaying a reduced first page within the virtual screen among a plurality of reduced pages, wherein the virtual screen is overlaid on the main screen, wherein the virtual screen interworks with the main screen by displaying contents of a reduced page displayed on the virtual screen also on the main screen, and wherein at least one virtual button is further provided on the virtual screen, the at least one virtual button being mapped with the at least one hardware button installed outside of the main screen of the electronic device; while displaying the reduced first page within the virtual screen, receive a second touch input on the virtual screen for changing a page on the virtual screen; and in response to the reception of the second touch input, display a reduced second page corresponding to a previous or next page to the reduced first page within the virtual screen, and display a second page corresponding to a previous or next page to the first page within the main screen, and wherein while the virtual screen is displayed, the designated button is neither displayed on the main screen nor the virtual screen. a display unit; an input unit; at least one hardware button; and a controller operatively coupled with the display unit and the input unit, the controller is configured to: display a main screen, wherein displaying the main screen comprises displaying a first page within the main screen among a plurality of pages, wherein each page comprises at least one icon and at least one button (313,316); while displaying the first page within the main screen, receive a first touch input on a designated button of the at least one button displayed on the first page for determining a virtual screen; in response to the reception of the first touch input, display the virtual screen that is a smaller version of the main screen, wherein displaying the virtual screen comprises displaying a reduced first page within the virtual screen among a plurality of reduced pages, wherein the virtual screen is overlaid on the main screen, wherein the virtual screen interworks with the main screen by displaying contents of a reduced page displayed on the virtual screen also on the main screen, and wherein at least one virtual button is further provided on the virtual screen, the at least one virtual button being mapped with the at least one hardware button installed outside of the main screen of the electronic device; while displaying the reduced first page within the virtual screen, receive a second touch input on the virtual screen for changing a page on the virtual screen; and in response to the reception of the second touch input, display a reduced second page corresponding to a previous or next page to the reduced first page within the virtual screen, and display a second page corresponding to a previous or next page to the first page within the main screen, and wherein while the virtual screen is displayed, the designated button is neither displayed on the main screen nor the virtual screen. display a main screen, wherein displaying the main screen comprises displaying a first page within the main screen among a plurality of pages, wherein each page comprises at least one icon and at least one button (313,316); while displaying the first page within the main screen, receive a first touch input on a designated button of the at least one button displayed on the first page for determining a virtual screen; in response to the reception of the first touch input, display the virtual screen that is a smaller version of the main screen, wherein displaying the virtual screen comprises displaying a reduced first page within the virtual screen among a plurality of reduced pages, wherein the virtual screen is overlaid on the main screen, wherein the virtual screen interworks with the main screen by displaying contents of a reduced page displayed on the virtual screen also on the main screen, and wherein at least one virtual button is further provided on the virtual screen, the at least one virtual button being mapped with the at least one hardware button installed outside of the main screen of the electronic device; while displaying the reduced first page within the virtual screen, receive a second touch input on the virtual screen for changing a page on the virtual screen; and in response to the reception of the second touch input, display a reduced second page corresponding to a previous or next page to the reduced first page within the virtual screen, and display a second page corresponding to a previous or next page to the first page within the main screen, and wherein while the virtual screen is displayed, the designated button is neither displayed on the main screen nor the virtual screen.