Provided is a mobile terminal including a graphic memory that includes multiple graphic memory areas in which different pieces of image data are stored, and that provides pieces of first image data that are stored in one or several graphic memory areas that are selected according to a control command; a display unit that is switchable between an activated state and an inactivated state, and to which an image that corresponds to the first image data is output, in the inactivated state; a controller that generates the control command, based on the size of the image, and that controls the display unit in such a manner that the image which corresponds to the first image data is output; and a power source unit that applies a power to a graphic memory area that is selected from among the multiple graphic memory areas, according to the control channel.