An image processing apparatus includes at least one processor operatively coupled to a memory, and serving as a determiner configured to determine a weight coefficient of a first region 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 output image. In one aspect, the weight coefficient is set to reduce a blur of a second object that is at a closer range side than a first object in the first region. In another aspect, a sum of the weight coefficients of the plurality of parallax images is constant in the first region.