To further improve security without reducing the operability in a process control system designed to perform automatic identification authentication by RFID (Radio Frequency Identification).

This process control system comprises an operation terminal 2 and an IC tag 3 to be mounted on an operator, and allows the operator authenticated by the IC tag 3 to operate a process to be controlled with the operation terminal 2. The process control system authenticates each operation for process control by the IC tag, determines success or failure of each operation based on the identification authentication for each operation, and receives one operation on the condition that the operation is established by operation success/failure determination processing.