1. An image printer having a display unit, the image printer comprising: a user interface unit for selecting an image by a user; an image processing unit for processing the image selected by a user in accordance with a manually selected predetermined image processing technique selected by the user prior to setting the selected image as a background picture of the display unit; a scaling unit for scaling the image in accordance with the size of the display unit; and a setting unit for setting the processed image as the background picture of the display unit; wherein the background picture is set with image scaling, sharpening, brightness adjustment, color contrast adjustment and rotation determination via user command, and a state of the image is controlled and the letters or figures which are displayed along with the processed image are processed into a complementary color of the processed image; wherein the display unit displays the processed image; wherein the image processing unit comprises a division unit for dividing the processed image to acquire a predetermined image area, which is superimposed upon the processed image, where letters or figures are positioned within an outline of the image area shape.