The present invention generates first developed image data by correcting image data with use of a first white balance correction value corresponding to a first light source, generates second developed image data by correcting the image data with use of a second white balance correction value corresponding to a second light source, calculates a color evaluation value of each of blocks by adding and averaging color evaluation values of pixels in the image data for each of the divided blocks, calculates a combining ratio based on a difference between the calculated color evaluation value of each of the blocks and a color evaluation value of white under the second light source, and combines the first developed image data and the second developed image data according to the calculated combining ratio.