To quickly transmit information to occupants of a vehicle at the right time by improving display processing speed of a display screen in a vehicle-mounted image display device.

This image display control device 10 disperses mediation of an image display based on a plurality of input signals into two stages of a general application mediation part 11b and an application final mediation part 11c. In prior to the image display based on a plurality of the input signals, image data is developed in a stationary image drawing area 12a, a variable image drawing area 12b and an image drawing area 13a in advance. To request indication of important information relating to safety of traveling of an automobile 1, an safety system application execution part 14a outputs image indication requests to the application final mediation part 11c through the indication mediation at the general application mediation part 11b.