An image processing apparatus, comprising: a chipset unit arranged to process data; a connector compliant with high-definition multimedia interface (HDMI) standards which comprises a plurality of terminals including a first terminal, a second terminal being the TDMS data 2 shield terminal of the connector, and a third terminal being the DDC Clock terminal of the connector, the connector being arranged to connect with a cable so that the chipset unit can transmit and receive a signal to and from an external device; a power supply arranged to supply power to the chipset unit and to a switching unit; and, the switching unit arranged to supply power of the image processing apparatus to the external device through said first terminal, and to selectively control a switching operation about whether to supply power of the image processing apparatus to the first terminal on the basis of a signal state of said second terminal when the cable is connected to the connector; wherein said third terminal is supplied with a voltage of the image processing apparatus; whereby said signal state is a first voltage signal state when the cable connected to the connector is compliant with HDMI standards such that the second terminal is not thereby connected to the third terminal, and said signal state is a second voltage signal state when the cable connected to the connector is compliant with mobile high-definition link standards such that the second terminal is thereby connected to the third terminal and to said supplied voltage thereof; and, wherein the switching unit is arranged to detect said second voltage signal state of said second terminal while the chipset unit is in a stand-by mode and, if so detected, to supply power of the image processing apparatus to the first terminal. a chipset unit arranged to process data; a connector compliant with high-definition multimedia interface (HDMI) standards which comprises a plurality of terminals including a first terminal, a second terminal being the TDMS data 2 shield terminal of the connector, and a third terminal being the DDC Clock terminal of the connector, the connector being arranged to connect with a cable so that the chipset unit can transmit and receive a signal to and from an external device; a power supply arranged to supply power to the chipset unit and to a switching unit; and, the switching unit arranged to supply power of the image processing apparatus to the external device through said first terminal, and to selectively control a switching operation about whether to supply power of the image processing apparatus to the first terminal on the basis of a signal state of said second terminal when the cable is connected to the connector; wherein said third terminal is supplied with a voltage of the image processing apparatus; whereby said signal state is a first voltage signal state when the cable connected to the connector is compliant with HDMI standards such that the second terminal is not thereby connected to the third terminal, and said signal state is a second voltage signal state when the cable connected to the connector is compliant with mobile high-definition link standards such that the second terminal is thereby connected to the third terminal and to said supplied voltage thereof; and, wherein the switching unit is arranged to detect said second voltage signal state of said second terminal while the chipset unit is in a stand-by mode and, if so detected, to supply power of the image processing apparatus to the first terminal.