A registration apparatus obtains, from an image pickup apparatus, identification information set in a lens apparatus that is attached to the image pickup apparatus. The registration apparatus pre-stores lens information including information that identifies the models of lens apparatuses and corresponding correction information, such that the lens information can be referenced by identification information. The registration apparatus displays a list of the stored lens apparatus models in a confirmation window such that the models of lens apparatuses corresponding to obtained identification information can be distinguished from the models of other lens apparatuses.