NOVELTY - The carbonaceous material and oxygen-containing gas are introduced into gasification reactor (12). Portion of the material is gasified. Generated product gas and fly ash containing residual carbon is discharged to particle separator (42). Fly ash is separated from product gas. Separated fly ash and oxygen-containing gas are introduced into cyclone combustor (50) such that residual carbon in the ash is combusted. Generated exhaust gas and ash are removed form the combustor. A portion of exhaust gas is introduced to reactor (12).    USE - For gasifying carbonaceous material.    ADVANTAGE - The carbonaceous material is efficiently gasified with suppressed amount of residual carbon content in discharged ash.    DETAILED DESCRIPTION - The carbonaceous material is introduced into a gasification reactor. An oxygen-containing gas is introduced into bottom portion of the gasification reactor. A portion of the material is gasified to product gas, and ash containing residual carbon is generated. The product gas and fly ash containing residual carbon entrained from the gasification reactor is discharged and conducted along a product gas channel (30) to a particle separator, and the fly ash containing residual carbon is separated from the product gas. The separated fly ash containing residual carbon and oxygen-containing gas are introduced into a cyclone combustor such that the residual carbon is combusted and exhaust gas and ash are generated and separately removed form the cyclone combustor. A portion of the exhaust gas is introduced to the gasification reactor above the bottom portion to act as secondary gasification gas. Thus, the carbonaceous material is gasified. An INDEPENDENT CLAIM is included for gasification apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows the schematic illustration of gasification of carbonaceous material.    Gasification system (10)    Gasification reactor (12)    Supply unit (14)    Gasification gas channel (18)    Separator (24)    Product gas channel (30)    Particle separator (42)    Cyclone combustor (50)