An illumination control device includes sub controllers each having output ports for controlling a light source of a plurality of light sources and a main controller connected to the sub controllers respectively and controlling the light sources via the sub controllers. Each of the sub controllers controls a lighting form of the corresponding light source of the light sources in accordance with a signal input from the main controller. The main controller transmits, to each of the sub controllers, assignment information representing assignment states of the light sources with respect to the output ports of each of the sub controllers and event information specifying the lighting forms of the light sources. Each of the sub controllers controls the lighting forms by specifying the assignment states of the light sources corresponding to the output ports in accordance with the assignment information.