NOVELTY - Method for processing organic wastewater, involves firstly removing first precipitated sludge from organic wastewater, performing activated sludge removal process by removing first precipitated sludge, performing surplus sludge removal process by removing surplus sludge, introducing first precipitated sludge and surplus sludge into methane fermentation tank (9), and performing methane fermentation process to the sludge.    USE - The method and apparatus are useful for processing organic wastewater (claimed).    ADVANTAGE - The method is cost-effective, easy and simple, and enables processing wastewater in large quantities using smaller heat energy.    DETAILED DESCRIPTION - Method for processing organic wastewater, involves firstly removing first precipitated sludge from organic wastewater, performing activated sludge removal process by removing first precipitated sludge, performing surplus sludge removal process by removing surplus sludge, introducing first precipitated sludge and surplus sludge into methane fermentation tank (9), and performing methane fermentation process to the sludge. The method involves subjecting the first precipitated sludge to souring process at 30-40 degrees C for 3-4 days, subjecting the surplus sludge to solubilization process at 60-90 degrees C, mixing the obtained products, and introducing the mixture into the methane fermentation tank. An INDEPENDENT CLAIM is included for organic wastewater processing apparatus, which comprises first solid-liquid separation unit (1), aerator (5), second solid-liquid separation unit (6), methane fermentation tank, boiler (11), souring processing tank (3), solubilization processing tank (8), and heating unit.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of organic wastewater processing apparatus. (Drawing includes non-English language text)    First solid-liquid separation unit (1)    Souring processing tank (3)    Aerator (5)    Second solid-liquid separation unit (6)    Solubilization processing tank (8)    Methane fermentation tank (9)    Boiler (11)