There is provided with an image processing apparatus. An obtaining unit obtains a visible light image and an invisible light image of an imaging region. A first evaluation unit evaluates a brightness of the imaging region. A second evaluation unit evaluates noise in an object in the imaging region. A combining unit generates a combined image by combining the visible light image and the invisible light image. An output unit outputs either the combined image or the invisible light image in accordance with an evaluation result on the noise without outputting the visible light image in response to the brightness becoming lower than a first threshold during an operation of outputting the visible light image.