To provide a structure capable of more reliably completing a series of processes performed by a plurality of devices.
There is provided a system comprising: a plurality of processing devices that execute a predetermined process according to an input process request, wherein each of the plurality of processing devices is connected to at least one other processing device such that information is transmittable, wherein the process request is input from an external device connected to any of the plurality of processing devices, and wherein each of the plurality of processing devices starts the predetermined process on the basis of, among the other processing devices, all processing devices receiving information from the external device via the processing device having completed the predetermined process normally.