Endoscope apparatus and operating method of endoscope apparatus

An endoscope apparatus comprising:

• a light source configured to emit illumination light including light in a first wavelength band included in a blue wavelength band, light in a first narrowband included in a green wavelength band, and light in a second narrowband having a same light absorption coefficient of hemoglobin as that of the light in the first narrowband;
• an imager configured to capture an image of return light from an object that receives the illumination light so as to acquire a first image that is an image of the object in the first wavelength band, a first narrowband image that is an image of the object in the first narrowband, and a second narrowband image that is an image of the object in the second narrowband;
• and
• a processor including hardware, the processor being configured to implement:
• acquiring scattering characteristics information that is information about scattering characteristics of the object based on a comparison result between the first narrowband image and the second narrowband image;
• and
• generating an observation image using the first image, the first narrowband image, and the scattering characteristics information.