A verification apparatus includes reads an image on a sheet conveyed using a plurality of imaging units configured to respectively perform reading in read regions different from each other in a predetermined direction orthogonal to a conveyance direction of the sheet, the read regions respectively corresponding to adjacent imaging units partially overlapping with each other. The apparatus performs processing of changing a size, in the predetermined direction, of a larger one of a read image obtained by reading the image on the sheet by each of the plurality of imaging units, and a corresponding reference image, in accordance with a size of a smaller one, and performs verification by comparing the read image corresponding to each of the plurality of imaging units with the corresponding reference image, after the processing has been completed.