1. A mobile terminal device, comprising: a first display section; a second display section arranged juxtaposed with the first display section; a display control section which controls display of the first display section and the second display section; and a detecting section which detects a dragging operation to an object to be moved displayed on the first display section or the second display section, wherein the display control section is operable: to execute a reduced screen display processing of reducing in size a display Screen displayed on the first display section and the second display section to display the reduced display screen on the display section on which the dragging operation is being performed, when the object to be moved is being dragged; and to return the reduced display screen to a display screen of a size before the size reduction to display the display screen of the size before the size reduction on the first display section and the second display section when the dragging operation has finished, and to display the object to be moved at a position, on the display screen of the size before the size reduction, corresponding to a position of the object to be moved on the reduced display screen at a time when the dragging operation has finished.