Abstract: There is disclosed a home network system using a DC power bus. The network system with a network server and more than one device being connected comprises a main power supply means for converting an AC power into a DC power to supply the DC power to the more than one device; and a DC power bus for providing a supply path of the DC power converted by the main power supply means. Since the DC power is supplied to each device via a power outlet located on the DC power bus, it is possible to supply the power necessary to each device of various kinds included in the network system more efficiently using the main power supply means and the DC power bus. Further, it is possible to prevent the DC power from being supplied to the area to which the power does not need to be supplied, by switching on/off a power breaker within the main power supply means automatically with regards to operation states of the devices located in each area at home, which results in preventing unnecessary power consumption.