Patent ID: 8074089

Claim:
A power supply controlling system comprising a receiving device, a power supply device that supplies electric power to an information processing apparatus outputting first and second video signals, and a transmitting device connected to the information processing apparatus, the receiving device including: a power supply switch; and a transmitting portion that transmits a switch signal of the power supply switch used for on/off of the power supply device to the transmitting device via second signal lines used for the reception of the second video signal, which are different from first signal lines used for the reception of the first video signal, the transmitting device including: an acquiring portion that acquires the switch signal of the power supply switch from the second signal lines on which the second video signal and the switch signal of the power supply switch are mixed; and an outputting portion that outputs the switch signal of the power supply switch to the power supply device, wherein the receiving device and the transmitting device are connected to each other with a single cable including the first signal lines and the second signal lines.