Abstract: A digital copying apparatus including an image reader for reading a document, an engine portion for conducting copying operation and a liquid-crystal display or displaying an image of the document read by the image reader, in which an image edition mode for conducting the image editing such as trimming and erasing of the document image is provided, and frames necessary for image editing such as a document frame indicating a document position automatically, a frame indicating a size of a copy paper on which the image is formed and a frame indicating a copiable area in the image edition mode, are displayed on the liquid-crystal display together with the document image.