1. A display device comprising: an image acquisition device for photographing a reference color standard; a display which displays a screen comprising a first region, in which the reference color standard is displayed, and a second region in which a color standard, which is acquired by photographing the reference color standard through the image acquisition device, is displayed; a color measurer which measures color of the acquired color standard displayed on the second region of the screen of the display; and a color calibrator which calibrates colors of an image acquired through photographing by the image acquisition device using color information measured by the color measurer.