A connector for coupling a first electronic device and a second electronic device with a power source to enable the power source to provide a current to the first electronic device and the second electronic device, wherein the first electronic device is able to communicatively be connected to the second electronic device via the connector and supply power to the second electronic device, and the connector comprises: a first connector component configured to be coupled with the first electronic device; a power-supplying connector component configured to be coupled with the power source; a power line (136a, 136b, 136c) configured to be coupled with a power source port of the first connector component, a power source port of the second electronic device, and a power source port of the power-supplying connector component to supply power to the second electronic device and the first electronic device by the power source; a data line having a first end coupled with a data transmission port of the second electronic device, and a second end coupled with a data transmission port of the first connector component, the data line configured to communicate at least one of video data and picture data from the first electronic device to the second electronic device for display operation of the second electronic device; a power-supplying state detection circuit configured to be coupled with the power-supplying connector component and to detect whether the power-supplying connector component is coupled with the power source; and a message transmission line having a first end coupled with the power-supplying state detection circuit, wherein a second end of the message transmission line is coupled with the second electronic device, the power-supplying state detection circuit is configured to transmit a power source connection message to the second electronic device via the message transmission line when it is detected that the power-supplying connector component is coupled with the power source, to enable the second electronic device to transmit a power-supplying-stop message to the first electronic device, and the power-supplying-stop message is configured to inform the first electronic device to stop supplying power to the second electronic device, wherein the power source connection message is configured to indicate that the power-supplying connector component is coupled with the power source, and wherein the data line and the power line are configured to be integrated into a first connecting cable, the message transmission line is configured to be integrated in a second connecting cable, and the first connecting cable and the second connecting cable are configured to be integrated in a same one connecting cable. a first connector component configured to be coupled with the first electronic device; a power-supplying connector component configured to be coupled with the power source; a power line (136a, 136b, 136c) configured to be coupled with a power source port of the first connector component, a power source port of the second electronic device, and a power source port of the power-supplying connector component to supply power to the second electronic device and the first electronic device by the power source; a data line having a first end coupled with a data transmission port of the second electronic device, and a second end coupled with a data transmission port of the first connector component, the data line configured to communicate at least one of video data and picture data from the first electronic device to the second electronic device for display operation of the second electronic device; a power-supplying state detection circuit configured to be coupled with the power-supplying connector component and to detect whether the power-supplying connector component is coupled with the power source; and a message transmission line having a first end coupled with the power-supplying state detection circuit, wherein a second end of the message transmission line is coupled with the second electronic device, the power-supplying state detection circuit is configured to transmit a power source connection message to the second electronic device via the message transmission line when it is detected that the power-supplying connector component is coupled with the power source, to enable the second electronic device to transmit a power-supplying-stop message to the first electronic device, and the power-supplying-stop message is configured to inform the first electronic device to stop supplying power to the second electronic device, wherein the power source connection message is configured to indicate that the power-supplying connector component is coupled with the power source, and wherein the data line and the power line are configured to be integrated into a first connecting cable, the message transmission line is configured to be integrated in a second connecting cable, and the first connecting cable and the second connecting cable are configured to be integrated in a same one connecting cable.