A method for dynamic collision avoidance of graphical and textual elements on a display is disclosed. Two alternative methods are disclosed for performing this function, namely, refraction of the UV fluorescence through the fiber onto a paper or screen, and alternately interrupting the left and right UV beams, then directly observing the fluorescence pattern of the UV beam on the fiber core to determine alignment. The display part is arranged on the accepting unit that is removable from the main unit. The complex device then records output history data having the sheet ID of the original paper sheet associated with the sheet ID of the paper sheet on which copying is to be performed, and transmits the output history data to a managing computer.