A display input device includes a display unit, a display control section, a touch panel, a message control section, and a determination section. When there is a notification item to notify a user during processing of an image forming device, the message control section instructs the display control section on contents of a message. The determination section determines whether a predetermined event has occurred. When the determination section determines that the predetermined event has occurred, the display control section changes a transmittance of a pop-up display.