An image processing apparatus performs first calculation configured to calculate a conversion coefficient, with respect to images having a same exposure, with respect to a plurality of images, second calculation configured to calculate a conversion coefficient of images having different exposures, positional adjustment configured to execute positional adjustment with respect to the plurality of images by using the conversion coefficient calculated in the second calculation, and composition configured to execute composition with respect to the images to generate a composite image having a dynamic range and a viewing angle wider than the images, and in the second calculation an image used for detection with respect to a part of images from among the plurality of images is newly generated.