Endoscope apparatus and method of displaying object image using endoscope

An endoscope apparatus comprising:

• an irradiating section that illuminates an object to be examined with illumination light;
• an image pickup section that receives reflected light of the illumination light irradiated to the object to be examined by the illuminating section and picks up an image of the object to be examined;
• an image signal processing section that generates, based on an image pickup signal obtained by the image pickup section, an average image signal, which is an average value of weighted pixel values, from image pickup signals of at least two or more narrow band wavelengths, generates a first image signal with a high-frequency component suppressed with respect to the average image signal, generates a difference image signal, which is a difference value of the weighted pixel values, from image pickup signals of predetermined two narrow band wavelengths, and generates a second image signal with a high-frequency component suppressed with respect to the difference image signal;
• and
• a display section that allocates the first image signal and the second image signal to one or more predetermined color channels and performs display.