In a system with a plurality of image processing apparatuses connected communicably, customization of various kinds of information displayed on each image processing apparatus is facilitated. In order to achieve this object, an information processing method of the invention is an information processing method in a copying machine (102) communicably connected to a GUI generation device (104). The method includes a display step of displaying a screen registered in advance in image processing, a step (step S601) of requesting, of the GUI generation device (104), information about the display contents of the screen in a predetermined state, a step (step S602) of receiving the information about the display contents of the screen from the GUI generation device (104), and a step of generating a screen by using the received information about the display contents of the screen. In the display step, the screen generated in the generation step is displayed in the predetermined state.