1 : An image processing device comprising: a detection unit configured to detect a narrow-angle area of a wide-angle image, wherein the wide-angle image was generated using a first exposure condition, the first exposure condition based on a first area of the wide-angle image, different from the narrow-angle area; a control unit configured to determine a second exposure condition for the narrow-angle area; and an image synthesis unit configured to generate a synthetic image by synthesizing a narrow-angle image and the wide-angle image, wherein the narrow-angle image has narrower angle of view than the wide-angle image and was generated using the second exposure condition.