A method of providing a reference image and an image capturing device to which the method is applied. The method includes displaying a reference image and a captured image in first and second areas, respectively, on a single display screen; and displaying a first GUI including image capturing information on the reference image on one side of the first area and a second GUI including image capturing information on the captured image on one side of the second area. A user can easily and effectively capture an image by using the reference image.