Method for transmitting and receiving power by using hdmi and device therefor

A power provider device for supplying power to a plurality of power consumer devices, comprising:

• a plurality of ports configured to transmit and receive data, which is connected to a plurality of power consumer devices through a High Definition Multimedia Interface (HDMI) cable;
• a power control unit configured to control power supply through the HDMI;
• and
• a control unit configured to control the plurality of ports and the power control unit,
• wherein the power provider device is configured to:
• supply power to the plurality of power consumer devices through the plurality of ports,
• detect a connection release between a first power consumer device among the plurality of power consumer devices and a port,
• detect a second power consumer device which is provided with insufficient power currently among the plurality of power consumer devices,
• notify remaining supply power levels that are available to additionally supply to the second power consumer device,
• receive a request of a power level that the second power consumer device is to receive among the remaining supply power levels, and
• supply the power additionally to the second power consumer device as much as the requested power level.