NOVELTY - A biomass processing system has a hydrogen fermenter (2) which carries out hydrogen fermentation of biomass (1), a hydrogen fermentation gas recovery apparatus (21) connected with fermenter (2), a methane-fermentation tank (5), a methane-fermentation gas recovery apparatus (22), a solid-liquid separator (8), and a heating apparatus (11) equipped with a drying furnace and a carbonization furnace.    USE - For processing biomass such as organic waste, organic refuse, livestock excrements, sewage sludge, resource crops and waste material, and generates methane gas used as fuel.    ADVANTAGE - The system efficiently processes biomass with high thermal efficiency, and is compact, by simple method and by reducing moisture content of anerobic fermentation residue.    DETAILED DESCRIPTION - A biomass processing system has a hydrogen fermenter (2) which carries out hydrogen fermentation of biomass (1), a hydrogen fermentation gas recovery apparatus (21) connected with fermenter (2), a methane-fermentation tank (5), a methane-fermentation gas recovery apparatus (22), a solid-liquid separator (8), and a heating apparatus (11) equipped with a drying furnace and a carbonization furnace. Apparatus (21) recovers produced hydrogen fermentation gas (3). Tank (5) carries out methane fermentation of hydrogen fermentation residue (4), and apparatus (22) recovers produced methane-fermentation gas (6). The solid-liquid separator performs solid-liquid separation of methane fermentation residue (7), and recovers dehydrated residue (9). The heating apparatus carbonizes the dehydrated residue.    An INDEPENDENT CLAIM is also included for processing of biomass, comprising producing hydrogen fermentation gas and hydrogen fermentation residue by carrying out hydrogen fermentation of biomass. The hydrogen fermentation residue is subjected to methane fermentation to obtain methane-fermentation gas and methane-fermentation residue. The methane-fermentation residue is subjected to solid-liquid separation to obtain dehydration filtrate (10) and dehydration residue. The obtained dehydration residue is heated to obtain carbonized material (12).    DESCRIPTION OF DRAWING(S) - The figure shows the systematic diagram of the biomass processing method.    biomass (1)    hydrogen fermenter (2)    hydrogen fermentation gas (3)    hydrogen fermentation residue (4)    methane-fermentation tank (5)    methane-fermentation gas (6)    methane-fermentation residue (7)    solid-liquid separator (8)    dehydration residue (9)    dehydration filtrate (10)    heating apparatus (11)    carbonized material (12)    hydrogen fermentation gas recovery apparatus (21)    methane-fermentation gas recovery apparatus (22)