An endoscope system includes a light source configured to generate violet light, blue light, green light, and red light, a filter switching mechanism configured to change a spectrum of the green light emitted from the light source, a light amount adjustment circuit configured to respectively adjust light amounts of lights in three colors, that is, the violet light, the blue light, and the red light, an image sensor configured to pick up an image of an object illuminated with the green light including the spectrum changed by the filter switching mechanism and the lights in the three colors respectively including the light amounts adjusted by the light amount adjustment circuit, and a highlighting processing circuit configured to subject an image obtained by image pickup of the object illuminated with the green light including the spectrum changed by the filter switching mechanism to highlighting processing.
