An image processing apparatus includes at least one processor operatively coupled to a memory. The at least one processor functions as a determiner configured to determine a weight coefficient that varies depending on a position in each of a plurality of parallax images, and an image generator configured to synthesize the plurality of parallax images based on the weight coefficient to generate an image. In addition, a sum of the weight coefficients of the plurality of parallax images is constant with respect to all positions in the plurality of parallax images.