A natural image with a three-dimensional effect is generated after correcting a high-luminance area of an image. The image processing apparatus of the present invention includes a first acquisition unit configured to acquire normal information corresponding to an image, an estimation unit configured to estimate a real illumination parameter based on a high-luminance area of an object included in the image, a first setting unit configured to set a virtual illumination parameter based on the real illumination parameter, and a lighting processing unit configured to perform lighting processing for the image based on the normal information and the virtual illumination parameter.