An endoscope apparatus 1 includes a light source device 4 configured to irradiate at least one or more illumination lights having a predetermined wavelength band on a subject, an image pickup device 2 configured to pick up an image of return light from the subject based on the irradiation by the light source device 4, a video processor 7, and an observation monitor 5. The video processor 7 applies, on the basis of a difference between a first image signal NL1 having a peak wavelength of a spectral characteristic and a second image signal NL2 having a peak wavelength of the spectral characteristic that a value in the absorption characteristic is lower than the value in the absorption characteristic of the first image signal and a scattering characteristic of the living tissue is suppressed more than the scattering characteristic of the first image signal NL1, between a wavelength band including a maximum value and a wavelength band at a minimum value in an absorption characteristic of a living tissue, processing for enhancing the first image signal NL1 and generates an enhanced and corrected image signal.
