An apparatus for providing direct current power to multiple direct current power loads of LED lighting lamp, direct current motor, actuator or direct current load under demand side load management at a distance at a time and for transmitting a load control command/data to one or more selected direct current power loads through the same power line and using it to control on/off, dimming, driving direct current motor, actuating actuator or demand side load management controlling, characterized in that the apparatus comprises: a transmission side and one or more reception sides connected each other with electric wires (A, B) for power transmission; a direct current power source connected to the transmission side and supplying power to the direct current power loads at a distance; the direct current power loads having their IDs and connected to each of the reception sides; an H-bridge driving circuit including transistors (Q1, Q2, Q3, Q4), MOSFETs or IGBTs disposed in the transmission side, the H-bridge driving circuit being connected to an output terminal of the direct current power source; an interface (I/F) unit transmitting the target power load ID and control command/data from a wired or wireless communication device to a first microcontroller); the first microcontroller disposed in the transmission side controlling an output of the H-bridge driving circuit, wherein the H-bridge driving circuit outputs a voltage level polarity (+), (-) pattern (Phase A, Phase B) of output power mapped in accordance with digital information '0' and '1' of a control command/data and power load's ID from the interface (I/F) unit, the control command/data and power load's ID being restored by analyzing the voltage level polarity (+), (-) pattern (Phase A, Phase B) of output power; a rectifier circuit with a front end and a rear end disposed in each reception side, the rectifier circuit receiving the voltage level polarity (+), (-) pattern (Phase A, Phase B) of output power from the H-bridge driving circuit and rectifying it into a flat direct current power, the flat DC power being used as a power source for the one or more direct current power loads connected to the reception side and for circuits of the reception side; a second microcontroller or a dedicated logic circuit disposed in each reception side; and a level shift unit connected to the front end of the rectifier circuit, the level shift unit changing a level of DC voltage of the electric wires (A, B) to a level that can be used in the second microcontroller or the dedicated logic circuit, wherein the second microcontroller or the dedicated logic circuit analyzes the level-shifted voltage level polarity (+), (-) pattern (Phase A, Phase B), and decodes it to a transmitted control command or data information for controlling the loads connected to each reception side. a transmission side and one or more reception sides connected each other with electric wires (A, B) for power transmission; a direct current power source connected to the transmission side and supplying power to the direct current power loads at a distance; the direct current power loads having their IDs and connected to each of the reception sides; an H-bridge driving circuit including transistors (Q1, Q2, Q3, Q4), MOSFETs or IGBTs disposed in the transmission side, the H-bridge driving circuit being connected to an output terminal of the direct current power source; an interface (I/F) unit transmitting the target power load ID and control command/data from a wired or wireless communication device to a first microcontroller); the first microcontroller disposed in the transmission side controlling an output of the H-bridge driving circuit, wherein the H-bridge driving circuit outputs a voltage level polarity (+), (-) pattern (Phase A, Phase B) of output power mapped in accordance with digital information '0' and '1' of a control command/data and power load's ID from the interface (I/F) unit, the control command/data and power load's ID being restored by analyzing the voltage level polarity (+), (-) pattern (Phase A, Phase B) of output power; a rectifier circuit with a front end and a rear end disposed in each reception side, the rectifier circuit receiving the voltage level polarity (+), (-) pattern (Phase A, Phase B) of output power from the H-bridge driving circuit and rectifying it into a flat direct current power, the flat DC power being used as a power source for the one or more direct current power loads connected to the reception side and for circuits of the reception side; a second microcontroller or a dedicated logic circuit disposed in each reception side; and a level shift unit connected to the front end of the rectifier circuit, the level shift unit changing a level of DC voltage of the electric wires (A, B) to a level that can be used in the second microcontroller or the dedicated logic circuit, wherein the second microcontroller or the dedicated logic circuit analyzes the level-shifted voltage level polarity (+), (-) pattern (Phase A, Phase B), and decodes it to a transmitted control command or data information for controlling the loads connected to each reception side.