A digital copying apparatus capable of forming a binding at an appropriate position with respect to a copy image irrespective of an orientation of an original document. The digital copying apparatus detects orientations of the original document, an original image and a copy sheet, and rotates original image data in accordance with the detected orientations so as to accord the orientations of the original image and a copy image. When the rotated original image data is formed on the copy sheet as the copy image, formation of the copy image is controlled to provide a binding at the relative position in relation to the copy image by shifting the copy image with respect to the copy sheet.