The invention provides an image forming system in which an image forming apparatus (MFP) is connected to a host device through a network, wherein a command for a processing of print data of a user is accepted, a presence of a print job specifying a storage processing by the user is detected from the command, the print job thus detected is displayed on the host device, the user can select whether the detected print job can be renewed or not, and renewal information of the print job is added and data are transmitted from the host device to the MFP when the renewal of the print job is selected.