A printing apparatus prints an image in a right direction based on an open/close state of a flap of a held envelope and on a position of the flap received from a user. A control method for controlling a printing apparatus, includes determining whether an envelope having a flap is held by a holding unit with its flap opened or the envelope is held by the holding unit with its flap closed, receiving, from a user, a front end, a far side, or a back end in the conveyance direction of the envelope as a position of the flap of the envelope held by the holding unit, and performing control such that a direction of an image to be printed on the envelope is decided based on a result of the determination and on the received position of the flap, and the image is printed on the envelope.