A POS terminal includes an application unit that outputs a first command that performs a first operation on a medium to a first communication port, or a second command that performs a second operation different from the first operation to a second communication port; a receiving unit that receives the first command or second command output by the application unit, the first command or the second command being received by the first communication port or the second communication port; a command control unit that converts the first command to a third command, or converts the second command to a fourth command; and a communication unit that transmits the third command or fourth command output from the command control unit to a third communication port.