Abstract: The invention provides a method for switching the size of an image displayed on a touch screen between a full-screen size and a normal size. A user can selectivity display the image on the touch screen in the full-screen size or the normal size by use of the method according to the invention. A user interface is previously defined. The user interface includes a first level, where a plurality of application icons are previously defined, and a second level wherein the image is previously defined. When the image is displayed on the touch screen in the full-screen size, the image covers the application icons which are not closed.