In an alternative print system, in case where an error making printing impossible occurs when an image forming device receives print data, the image forming device requests an alternative print as printing by an alternative device as an alternative image forming device of the image forming device itself to a print management system. When the alternative print is requested from the image forming device to the print management system, the print management system determines all of image forming devices included in one of the combination of the image forming devices to provide total printing speed equal to or higher than the printing speed of the image forming device that requests the alternative print to the print management system with the minimum number, and transmits the print data for the alternative print to the determined alternative device.