NOVELTY - A direct current (DC) converter (3) converts the voltage of the fuel cell power generator (2). An alternating current (AC)-DC power converter (42) converts the DC into alternating current (AC). The DC output terminal of AC-DC power converter and a DC load (5) are connected to the DC output terminal of DC power converter. An AC electric power system (6) is connected to the terminal of the AC input terminal of AC power converter, and to an AC load (7).    USE - For supplying electric power to DC load and AC load installed in house interior.    ADVANTAGE - The electric power can be supplied to the DC load by the fuel cell electric power generator stably, and the electrical energy supplied from the AC electric power system is reduced, and the electrical energy converted by the AC-DC converter is reduced. The conversion loss is reduced. The need for control apparatus for controlling the output of the AC-DC converter is avoided and the structure is simplified. By the AC converter and DC converter installed in the outdoor, the heat radiated from the DC converter is not transferred to house interior, and the electric power for cooling the house is avoided.    DETAILED DESCRIPTION - The AC load and DC current load are installed in the house interior (10) and the fuel cell power generator (11), AC converter and DC converter are installed in the outdoor. The AC load includes a cooling installation, and a DC load includes radio equipment that transmits, receives and converts the signal for mobile telephone. The DC converter is insulated so that an electric current do not flow into the input terminal from the output terminal. A measuring device measures the electric current and voltage supplied to the DC load. The fuel cell controller controls the fuel cell power generator based on the measurement result.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of the direct current distribution system. (Drawing includes non-English language text)    Fuel cell power generator (2)    DC converter (3)    DC load (5)    AC electric power system (6)    AC load (7)    House interior (10)    Outdoor (11)    AC to DC power converter (42)