From image data for foreign substance detection obtained by an image sensing device that converts an optical image of an object into image data, correction data is created for correcting photographed image data in a case that normal image sensing is performed, and by correcting the photographed image data using the correction data, image data is obtained in which effects due to a foreign substance have been removed. In a case where a foreign substance removal operation, which removes a foreign substance affixed to an optical member, has been executed, the correction data is updated, so that correction of subsequent photographed image data using old correction data is prevented.