A dryer includes a hollow casing accommodating a fan and a heater and having an open front and an open rear, and a display device disposed at the rear of the casing and covering at least a part of the open rear. The display device and a rear edge of the casing are spaced apart from each other to thereby form an air introduction area that is opened between the display device and a rear edge of the casing. The display device can display a graphic object on at least one of a plurality of display areas. A controller can select a drying object and change the graphic object to a suggested drying temperature based on pre-stored information of the drying object. The controller can also rotate the graphic object on the screen of the display panel based on a rotation posture of the dryer.