Methods and devices for selectively presenting a user interface in a dual screen device. A plurality of slots are formed so that electron beams are passed through the slots in vertical direction, and a vertical pitch distance PvC between slots located around horizontal center line is longer than a vertical pitch distance PvE between slots located around horizontal edge. The memory stores therein selection record information representing past record of selection of each of the plural items. The control winding has a pair of terminals across which is connected a diode.