A display input device includes a display panel to display a screen thereon, the screen including a plurality of display areas, and a memory to store specification information, GUI information, and layout information. The GUI information includes information on a plurality of GUIs to be displayed on the screen, the plurality of GUIs being classified into a plurality of groups of GUIs. The layout information associates each one of the plurality of display areas with one group of the plurality of GUIs to be displayed on each display area. The display input device further includes circuitry to scale each display area in accordance with a change in the size or the resolution of the screen, and change one of a size of at least one GUI to be displayed in the scaled display area and a number of GUIs to be displayed in the scaled display area.