An image file processing apparatus comprises a first storage unit configured to store an image, a first data creating unit configured to create main image data or sub-image data, a second storage unit configured to store the main image data and the sub-image data as one file, a management region setting unit configured to ensure management information of the sub-image data stored in the same file as the main image data in the second storage unit by a predetermined number and set the management information in a management region of the main image data, and a storage control unit configured to control so as to store the file based upon content set by the management region setting unit.