Terminals connected to a POS terminal can execute appropriate processes using functions of a browser. A POS system 1 has a first tablet terminal 101 that runs a browser; a second tablet terminal 102 that runs a browser; and a POS control device 11 that is communicatively connected to the first tablet terminal 101 and the second tablet terminal 102, and has a communication unit 20b that sends data received from the browser running on the first tablet terminal 101 to the browser running on the second tablet terminal 102.