NOVELTY - A biomass carbonizing-gasifying system comprises a two-stage gasifier (7) comprising a high-temperature gasification part (8) for gasifying a carbonized material (4), and gas reformer (9) having an outlet for reforming combustible pyrolysis gas (3) containing tar volatilized in the production of the carbonized material.    USE - The biomass carbonizing-gasifying system is used for pyrolytic decomposition of a biomass fuel by heating the biomass fuel in a carbonization chamber to produce a carbonized material and combustible pyrolysis gas containing volatilized tar; feeding the carbonized material to a high-temperature gasification part of a two-stage gasifier; feeding the combustible pyrolysis gas containing volatilized tar into the gas reformer; feeding a gasifying agent to the high temperature gasification part of the two-stage gasifier; and maintaining the temperature of gas at the outlet of the gas reformer at a level above a predetermined temperature level by feeding a controlled amount of gasifying agent containing oxygen to the gas reformer (claimed).    ADVANTAGE - The invented biomass carbonizing-gasifying system exhibits high thermal efficiency and power generation efficiency. It is capable of stably generating power .    DETAILED DESCRIPTION - A biomass carbonizing-gasifying system comprises carbonization chamber (2) for producing a carbonized material by heating a biomass fuel (1); two-stage gasifier comprising a high-temperature gasification part for gasifying the carbonized material, and a gas reformer having an outlet (10) for reforming combustible pyrolysis gas containing tar volatilized in the production of the carbonized material; mechanism for feeding carbonized material produced in the carbonization chamber to the high-temperature gasification part of the two-stage gasifier; a pyrolysis gas flow path (12) for sending the combustible pyrolysis gas produced in the carbonization chamber into the gas reformer of the gasifier; and gasifying agent feed mechanism (14) for feeding a gasifying agent to the high-temperature gasification part of the gasifier, and controllably feeding a gasifying agent containing oxygen to the gas reformer, where the temperature at the outlet of the gasifier can be prevented from falling below a predetermined temperature. INDEPENDENT CLAIMS are also included for:    (A) a biomass power generation system comprising generator set, operated by a gaseous fuel, and releasing exhaust heat in its operation; carbonizer for receiving biomass, and receiving exhaust heat released by the generator set and utilizing the exhaust heat for pyrolytically decomposing and carbonizing the biomass and producing char and pyrolysis gas containing volatilized tar; and a gasifier, arranged to receive the char, and the pyrolysis gas containing volatilized tar, from the carbonizer, for combustion, and gasification of the char and reforming the pyrolysis gas containing tar, to generate a gaseous fuel; and    (B) a method of generating power comprising operating a generator set and releasing exhaust heat in the operation of the generator set; utilizing the exhaust heat from the generator set for pyrolytically decomposing and carbonizing biomass in a carbonizer to produce char and pyrolysis gas containing volatilized tar; effecting combustion and gasification of the char, and reforming the pyrolysis gas, in a gasifier; and utilizing said gaseous fuel as a fuel for operation of the generator set.    DESCRIPTION OF DRAWING(S) - The figure is a schematic view of a biomass carbonizing-gasifying system.    Biomass fuel (1)    chamber (2)    Pyrolysis gas (3)    Carbonized material (4)    Gasifier (7)    Gasification part (8)    Gas reformer (9)    Outlet (10)    Pyrolysis gas flow path (12)    Gasifying agent feed mechanism (14)