A print relay system for transmitting a print job transmitted from a print service system to an image forming apparatus, the print service system being connected to the print relay system and configured to provide a print setting screen (Fig. 9B) including a common setting item to an information terminal operated by a user, to receive a print setting set by the user via the provided print setting screen (Fig. 9B), and to generate the print job based on the received print setting and stored settings for the image forming apparatus connected to the print relay system and configured to output image data based on the print job, the print relay system comprising: transmission means configured to transmit, to the information terminal, a detailed print setting screen (Fig. 19C) via which a detailed print setting is able to be set by a user, the detailed print setting being unable to be set via the common setting item of the print setting screen (Fig. 9B), the detailed print setting including at least one setting item of a required setting item and an image forming apparatus unique setting item; receiving means configured to receive a print job from the print service system, which is transmitted in a case that a print instruction is input by the information terminal to the print service system; determining means configured to determine whether or not a user has instructed a detailed print setting; job changing means configured, upon determining that detailed print setting has been set by the user, to receive the at least one setting item of the required setting item and the image forming apparatus unique setting item included in the detailed print setting, and to convert the print job received by the receiving means from the print service system into a new print job based on the received detailed print setting; and job transmission means configured, upon determining that detailed print setting has been set by the user, to transmit the new print job which has been converted by the job changing means to the image forming apparatus, and upon determining that no detailed print setting has been set, to transmit the print job received from the print service system to the image forming apparatus, wherein: the required setting item is an item for setting a print setting which cannot be set via the print setting screen (Fig. 9B) and which is required to be set to utilize the image forming apparatus for printing; and the image forming apparatus unique setting item is an item for setting a print setting which cannot be set via the print setting screen (Fig. 9B) and which is required to be set to utilize a function of the image forming apparatus. transmission means configured to transmit, to the information terminal, a detailed print setting screen (Fig. 19C) via which a detailed print setting is able to be set by a user, the detailed print setting being unable to be set via the common setting item of the print setting screen (Fig. 9B), the detailed print setting including at least one setting item of a required setting item and an image forming apparatus unique setting item; receiving means configured to receive a print job from the print service system, which is transmitted in a case that a print instruction is input by the information terminal to the print service system; determining means configured to determine whether or not a user has instructed a detailed print setting; job changing means configured, upon determining that detailed print setting has been set by the user, to receive the at least one setting item of the required setting item and the image forming apparatus unique setting item included in the detailed print setting, and to convert the print job received by the receiving means from the print service system into a new print job based on the received detailed print setting; and job transmission means configured, upon determining that detailed print setting has been set by the user, to transmit the new print job which has been converted by the job changing means to the image forming apparatus, and upon determining that no detailed print setting has been set, to transmit the print job received from the print service system to the image forming apparatus, wherein: the required setting item is an item for setting a print setting which cannot be set via the print setting screen (Fig. 9B) and which is required to be set to utilize the image forming apparatus for printing; and the image forming apparatus unique setting item is an item for setting a print setting which cannot be set via the print setting screen (Fig. 9B) and which is required to be set to utilize a function of the image forming apparatus. the required setting item is an item for setting a print setting which cannot be set via the print setting screen (Fig. 9B) and which is required to be set to utilize the image forming apparatus for printing; and the image forming apparatus unique setting item is an item for setting a print setting which cannot be set via the print setting screen (Fig. 9B) and which is required to be set to utilize a function of the image forming apparatus.