1. An image photographing apparatus comprising: a camera configured to acquire an image; a first image processing unit configured to process the acquired image into a preview image, a second image and a third image, the second and third image having an image quality different from each other and from an image quality of the preview image; a control unit configured to control image processing of the acquired image, the preview image, the second image and the third image; and a display unit configured to display the processed preview image, the processed second image, and the processed third image, wherein the display unit simultaneously displays the entire processed preview image at a reduced size, the entire processed second image at a reduced size, the entire processed third image at a reduced size and a level bar, wherein the level bar is provided by the control unit and is configured for individually adjusting the quality of the processed second image or the quality of the processed third image displayed on the display unit in real time, wherein the control unit displays remaining memory and the displayed remaining memory is configured for changing when the quality of the processed second image or the quality of the processed third image is adjusted in real time via the level bar, wherein the preview image is reduced by half with respect to the display unit and displayed on an entire half of the display unit, and wherein each of the second and third images is reduced to equal size and displayed on the other half of the display unit.