A processor device for an endoscope system including a light source unit (20, 702) that emits a plurality of types of illumination light beams with different wavelengths, a light source control unit configured to control the type of the illumination light beams to be emitted by the light source unit in accordance settings for region discrimination, and an image sensor (48, 704) that images an observation target, using the respective illumination light beams, the processing device comprising: a control unit configured to input the settings for region discrimination to the light source control unit; an image acquisition unit configured to acquire images corresponding to the respective illumination light beams; a first image generation unit configured to generate a first image serving as a base of a display image to be displayed on a display unit, using any of the images acquired by the image acquisition unit; a second image generation unit configured to generate a plurality of mutually different second images, each second image being generated using at least one image having a different corresponding wavelength from the image used for the generation of the first image among the images acquired by the image acquisition unit; a region discrimination unit configured to discriminate, for each second image, a region of a different type in the observation target, using a respective second image; and an enhancement processing unit configured to generate the display image in which each region discriminated by the region discrimination unit is enhanced, using the first image, wherein the enhancement processing unit generates the display image by changing an enhancement method for every region discriminated by the region discrimination unit meaning either changing a type of processing to be performed for each discriminated region or changing an importance of the processing for each discriminated region. a control unit configured to input the settings for region discrimination to the light source control unit; an image acquisition unit configured to acquire images corresponding to the respective illumination light beams; a first image generation unit configured to generate a first image serving as a base of a display image to be displayed on a display unit, using any of the images acquired by the image acquisition unit; a second image generation unit configured to generate a plurality of mutually different second images, each second image being generated using at least one image having a different corresponding wavelength from the image used for the generation of the first image among the images acquired by the image acquisition unit; a region discrimination unit configured to discriminate, for each second image, a region of a different type in the observation target, using a respective second image; and an enhancement processing unit configured to generate the display image in which each region discriminated by the region discrimination unit is enhanced, using the first image, wherein the enhancement processing unit generates the display image by changing an enhancement method for every region discriminated by the region discrimination unit meaning either changing a type of processing to be performed for each discriminated region or changing an importance of the processing for each discriminated region.