Display operation device allocating a plurality of functions to a key, image processing apparatus, and method of receiving user operations

摘要

A display operation device has a display-integrated operation panel with a display screen, on which a monochrome copy start key and a color copy start key are displayed. When black-toner-out or color-toner-out occurs, on the monochrome copy start key and the color copy start key, another UI component such as black-toner-out key and color-toner-out key is displayed. Such a UI component is displayed at the display position of the monochrome copy start key and the color copy start key, being superposed on these keys.