A light control system identifies in the processing that discriminates light sources in the acquired image as either luminous objects or reflective objects, each pixel obtained that constitutes the acquired image being classified into a plurality of groups according to the brightness of each pixel, and generates a histogram showing the relation of the brightness and the number of pixels of each group that are matched with each group. Then, when the number of pixels corresponding to the brightest group is less than the number of pixels corresponding to the other groups, the existence of the luminous object in the acquired image is determined, and when the number of pixels corresponding to the brighter group is more than the number of pixels corresponding to the other groups, the existence of the reflective object in the acquired image is determined.