An information terminal device including: a display section; an operation section receiving enlargement operation of enlarging one of a plurality of divided regions displayed on a display screen of the display section; a remaining region specification section specifying a remaining region on the display screen excluding the one divided region enlarged through the enlargement operation; an arrangement region determination section determining an arrangement region for arranging all the divided regions other than the one enlarged divided region in the remaining region; a reduced arrangement section arranging each of the other divided regions on a reduced scale in the arrangement region; and a display control section displaying, on an enlarged scale, an image of the one enlarged divided region and displaying, on an enlarged scale within the other divided regions arranged on a reduced scale by the reduced arrangement section, an image of a specific portion of the other divided regions.