A glass-type device which controls the output position of an image by using the location of the user's eye. The glass-type device includes: a display portion; a mirror portion that is placed on the path of light output from the display portion so as to reflect an image output on the display portion to an external object; a sensing portion that is placed on the path of light coming from the external object and reflected by the mirror portion so as to sense an image of the external object; and a controller that controls the output image by using the sensed image.