An image forming system includes a plurality of image forming apparatuses and an information processing apparatus, and the plurality of image forming apparatuses include a parent apparatus and a child apparatus(es). The parent apparatus transmits, when receiving a print instruction that is transmitted from the child apparatus for outputting operated by a user, print data to the child apparatus for outputting. The parent apparatus transmits, when transmission instruction data is included in the print data, print image data included in the print data to a transmission destination apparatus such as a child apparatus other than the child apparatus for outputting, the information processing apparatus and a further external apparatus with which the parent apparatus can perform communication via a network.