An image processing apparatus comprises at least one processor which function as: an obtaining unit configured to obtain one or more images; and a display control unit configured to display the one or more images on a display in a different display mode and to superimpose, on an image, information indicating a defocus range of the image on a basis of the display mode and defocus information. The display control unit changes, depending on whether a first number of images are displayed or a second number of images are displayed, displaying that uses information indicating a defocus range of focus or non-focus and information indicating a defocus range in which a focus position is changeable or a defocus range of a case where an aperture value is changed.