A lighting system which can obtain a relaxing effect of the fluctuation of color and brightness regardless of the appearance thereof is provided. The lighting system has a light source emitting illumination light, a memory section storing a lighting signal indicating the illumination light, a reading section reading the lighting signal from the memory section, and a control section controlling the light source based on the lighting signal read by the memory section. The lighting signal is a signal representing at least one of fluctuation of color and brightness in the illumination light by using synthetic waves in which a plurality of waves having different frequencies are synthesized.