Video output system, video output device, and cable

A video output system, comprising:

• a display apparatus including an input terminal;
• an information device including an input/output terminal;
• a video output device including an input/output terminal;
• a first cable which connects the input terminal of the display apparatus and the input/output terminal of the video output device;
• and
• a second cable which connects the input/output terminal of the information device and the input/output terminal of the video output device,
• wherein the input terminal of the display apparatus has an input terminal section which is connected to an embedded termination power source through a termination resistor,
• wherein each of the input/output terminal of the information device and the input/output terminal of the video output device has an output terminal section connected through a capacitor, and
• wherein the input/output terminal of the video output device has functions of
• detecting whether the input/output terminal of the video output device is connected to the input terminal of the display apparatus through the first cable or the input/output terminal of the video output device is connected to the input/output terminal of the information device through the second cable,
• drawing a DC current from the output terminal section of the video output device in a case where the connection to the input terminal of the display apparatus through the first cable is detected, and
• maintaining the output terminal section of the video output device in a high resistance state in a DC manner in a case where the connection to the input/output terminal of the information device through the second cable is detected.