1. An image forming system comprising: a transmitter apparatus that transmits, to a predetermined storage location of a plurality of storage locations, identification information identifying a user and image data associated with the identification information; and a plurality of image forming apparatuses, each of the plurality of image forming apparatuses including: a first storage unit that stores storage information indicating the plurality of storage locations; a storage location that is included in the plurality of storage locations and stores the identification information and the image data associated with the identification information, the identification information and the image data being transmitted from the transmitter apparatus; a retrieval unit that accesses the plurality of storage locations indicated by the storage information stored in the first storage unit, when the identification information is inputted by the user, and retrieves the image data from the storage location; and an image forming unit that forms an image corresponding to the image data retrieved by the retrieval unit.