Included are a first mobile terminal testing device that operates as an LTE base station, a second mobile terminal testing device that operates as an NSA 5G NR base station, and a test control device that controls the first mobile terminal testing device and the second mobile terminal testing device. The test control device includes a command input unit into which a control command for controlling the first mobile terminal testing device and the second mobile terminal testing device is input, a command transmission determination unit that determines a mobile terminal testing device of a transmission destination of the control command, and a command transmission unit that transmits the control command to a transmission destination determined by the command transmission determination unit. The command transmission determination unit determines the transmission destination of the control command according to the type of the control command.