Provided is a processing method, comprising: a step of a processing device 10 receiving from an input device 30 a data set and a key which identifies a process with respect to the data set, and inputting to an update acceptance device 20u the received data set and key; a step of the update acceptance device 20u identifying, on the basis of the key, an accumulation device 20s which accumulates the data set and transmitting to the accumulation device 20s an update request which includes the data set and the key; a step of the accumulation device 20s, upon receiving the update request, storing the data set in association with the key; a step of the accumulation device 20s acquiring the data set which has been stored in association with the key, and transmitting same to the processing device 10; and a step of the processing device 10, if the data set which has been acquired from the accumulation device 20s satisfies a condition of a data set which is necessary for a process which corresponds to the key, carrying
