Upon occurrence of an interruption factor before image data for one page of a target document has been stored in a storage device, a printing apparatus performs control to store specific data in a storage area of the storage device in which the remaining image data of the target document is to be stored. In a case where an interruption factor occurs before image data for one page of the target document has been stored in the storage device, the printing apparatus performs printing based on the image data of the target document and the specific data stored in the storage device.