PROBLEM TO BE SOLVED: To provide a latest image which is suitable for comparative observation and in which each light beam is optimized when two light beams, of which intensities are different from each other, are photographed.SOLUTION: An observation apparatus 100 comprises: a light source that irradiates a subject with two illumination light beams two imaging devices 55, 56 for respectively photographing two observation light beams from a subject generated by irradiation of the illumination light beams two image generation units 61, 62 for respectively generating images P, Q from the image information pieces acquired by the imaging devices 55, 56, respectively two control units 63, 64 for setting the photographing conditions including the exposure time on the basis of the brightness of each of the images P, Q and for respectively controlling the imaging devices 55, 56 so as to execute the subsequent photographing and display units 71, 72 for displaying the images P, Q as live images. The control units 63, 64 asynchronously control the imaging devices 55, 56, respectively on the basis of the imaging conditions.SELECTED DRAWING: Figure 1
