A medical control device comprising: an image processing section adapted to generate a captured image on a basis of an electric signal generated by an imaging device that captures an image of a subject; and a light source control information generation section adapted to generate control information for controlling a light quantity distribution of illumination light, according to a brightness distribution of the captured image; wherein the light source control information generation section converts the captured image generated by the image processing section to generate irradiation distribution information indicating the light quantity distribution of the illumination light according to the brightness distribution of the captured image; and charachterized in that the light source control information generation section converts a special light image captured with special light into a luminance image having a luminance value assigned to each pixel and generates an irradiation image as the irradiation distribution information by inverting the luminance image such that, in the irradiation image, a region in which a luminance value after the inversion is larger than a threshold is set as a white light projection region, and the image processing section generates a merged image obtained by merging the special light image and a white light image captured with white light whose light quantity distribution is commensurate with the irradiation image. an image processing section adapted to generate a captured image on a basis of an electric signal generated by an imaging device that captures an image of a subject; and a light source control information generation section adapted to generate control information for controlling a light quantity distribution of illumination light, according to a brightness distribution of the captured image; wherein the light source control information generation section converts the captured image generated by the image processing section to generate irradiation distribution information indicating the light quantity distribution of the illumination light according to the brightness distribution of the captured image; and charachterized in that the light source control information generation section converts a special light image captured with special light into a luminance image having a luminance value assigned to each pixel and generates an irradiation image as the irradiation distribution information by inverting the luminance image such that, in the irradiation image, a region in which a luminance value after the inversion is larger than a threshold is set as a white light projection region, and converts a special light image captured with special light into a luminance image having a luminance value assigned to each pixel and generates an irradiation image as the irradiation distribution information by inverting the luminance image such that, in the irradiation image, a region in which a luminance value after the inversion is larger than a threshold is set as a white light projection region, the image processing section generates a merged image obtained by merging the special light image and a white light image captured with white light whose light quantity distribution is commensurate with the irradiation image.