An endoscope system 1 includes a light source device 4, a CCD 2, a video processor 7, and an observation monitor 5, wherein the video processor 7 includes: a band decomposition processing section 111 that performs a decomposition processing for decomposing into a plurality of spatial frequency bands on a signal of an image picked up by the CCD 2, to generate a plurality of band images, to generate a plurality of band images an enhancement processing section 112 that performs an enhancement processing on selected band images based on an enhancement amount set for a region where an observation target in a subject is distributed in a feature space formed with wavelength bands or spatial frequency bands of the band images selected among the plurality of band images as axes and a color conversion processing section 113 that performs a color conversion processing for adjusting a color tone on the plurality of band images including the selected two or more band images having been enhanced.
