1. An inspection apparatus configured to perform position adjustment between a reference image and a target image of a printed document to inspect the printed document, the inspection apparatus comprising: an extraction unit configured to extract a feature point of each of the reference image and the target image used for the position adjustment; an acquisition unit configured to acquire an image in a band region of a predetermined size from each of the reference image and the target image; a position adjustment unit configured to perform a first position adjustment on the reference image and the target image in the band region, using each feature point in the band region extracted by the extraction unit; a first determination unit configured to compare the reference image and the target image after the first position adjustment and determine whether there is a difference between the reference image and the target image after the first position adjustment; and a second determination unit configured to determine whether there is a feature point for the first position adjustment in a region adjacent to the band region, in a case where the first determination unit determines that there is a difference between the reference image and the target image in the band region after the first position adjustment, wherein in a case where the second determination unit determines that there is no feature point for the first position adjustment in the region adjacent to the band region, the position adjustment unit performs a second position adjustment of the reference image and the target image after the first position adjustment using a feature point for the first position adjustment in the band region and additional patch information in the region adjacent to the band region, and wherein the determination unit determines whether there is a difference between the reference image and the target image after the second position adjustment, and wherein in a case where the second determination unit determines that there is a feature point for the first position adjustment in the region adjacent to the band region, the position adjustment unit does not perform the second position adjustment.