A plurality of screen aspects is acquired; each screen layout is optimized; switching of the screen aspects is supported; and visibility and functionality of the display screen are improved. An electronic device (portable terminal apparatus) including a display function in a rotatable and/or openable/closable case includes a displaying unit that displays a vertically elongated vertical screen or a horizontally elongated horizontal screen and a controlling unit (CPU) that changes screen layouts correspondingly to the vertical screen or the horizontal screen displayed on the displaying unit. The change in the screen layout corresponding to the vertical screen or the horizontal screen includes a change in arrangement of icons.