An interactive control system using a remote control signal in accordance with HDMI-CEC standards between a computer and an electric home appliance performs power supply control and screen display from a PC to a television, power supply control from the television to the PC, and application control on the PC. In the system, a personal computer (PC) is loaded with a controller capable of operating by a standby power supply. The remote control signal of a PC remote controller is input to an HDMI unit connector of a television through a photoreceiver controller of a PC, a USB/CEC power-on signal connector, a CEC unit connector, a signal line a, an HDMI unit connector, and a cable. The remote control signal of a TV remote controller is input to the cable, the HDMI unit connector, the CEC unit connector, a USB power supply connector, and a USB data processing unit.