Provided is an image forming system including plural image forming devices, a first storage unit that stores user information and device information, an updating unit that updates the device information, and a transmitting device that transmits image data to an image forming device, each image forming device including a second storage unit that stores the image data, a receiving unit that receives an input of the user information, a first acquiring unit that acquires image data from an image forming device, an image forming unit that forms an image, a counter unit that measures frequency in which image data is acquired by another image forming device and stores the user information, the device information, and the measured frequency in the second storage unit in a correlated manner, and a transmitting unit that transmits the user information and the device information to the updating unit.