In a server 10, a communication unit 12 receives a signal including processed data and a Bloom filter in accordance with a process pattern executed on the processed data transmitted from an edge equipment 20-2 directly connected to the server 10. A process pattern specifying unit 13 specifies a process pattern executed on the processed data received by the communication unit 12 based on the “process pattern list” and the Bloom filter received in the communication unit 12.