Provided is a depth image correction apparatus to correct depth information in a depth image, which acquires a depth image and correction information, and corrects the depth values of the depth image based on the correction information and generates a corrected depth image. The apparatus acquires, as the correction information, first confidence indicating reliability in the depth values, and second confidence indicating reliability in position in an in-plane direction vertical to the depth direction. The apparatus performs first correction processing of generating a first corrected depth image by correcting the depth image based on the first confidence and similarity of the depth values, and second correction processing of generating the corrected depth image by correcting the first corrected depth image based on the second confidence.