Main menu navigation principle for mobile phone user

A menu-driven electronic device utilizes a display and a single two-dimensional navigation key. The display is configured to selectively display one of a plurality of menus, including a main menu and a sub-menu. The two-dimensional navigation key is configured to select one of a plurality of main menu items and to select a sub-menu item of the sub-menu associated with a selected main menu item. A portion of the plurality of menu main items is displayed. The main menu and the sub-menu can be accessed by maintaining contact with the two-dimensional navigation key. The device is configured to display a main menu item icon to provide a visual reference to the selected main menu item in a menu tree of the menu being displayed. The device is preferably a cellular phone.