Endoscopic system (10) includes imaging unit (310), it is imaged onto object with imaging sensor, light source (210) issues illumination light and illuminates object, with laser treatment instrument (600), emit illumination light during laser subject can be emitted. Control device (100), endoscopic system (10) includes the instrument that unit (141) determines the first use state laser treatment, with a brightness regulating circuit (130), the light source (210) of imaging unit (310) and luminous quantity that the adjustment time for exposure is imaged by least one is based on by judging unit (141). Judgement result
