Any icon on a launcher screen 22 is changed from a basic-size (first-size) icon Is to a second-size icon Im one size larger than the basic-size icon Is and further a third-size icon IL further one size larger than the second-size icon Im in accordance with operation using an operation unit. The icons Is, Im and IL having different sizes are displayed with a difference in luminance from one to another. The basic-size icon Is is displayed with the darkest luminance, and the third-size icon IL is displayed with the brightest luminance. The third-size icon IL indicates the icon is an active icon. For example, when the icon is selected by operation using an “Enter” key or the like on the keyboard unit 112, execution of a function allocated to the icon is started.