The apparatus transmits first image data indicating form contents and setting information associated with the print sheet on which the form contents are printed in advance to a server managing data associated with the overlay-print process, for registration by the server. When an execution instruction of the overlay-print process is received, and the apparatus generates second image data of the image to be overlaid and printed on the print sheet used in the overlay-print process, generates associated information indicating association between a print attribute designated for the overlay-print process that uses the second image data, and transmits the second image data and the associated information to the server.