NOVELTY - Method for treating wastewater, involves (a) inflowing wastewater including sewage, effluent and wastewater containing excrements of livestock to the water collecting tank, (b) inducing release of phosphorus in anaerobic tank, (c) performing denitrification in an anoxic chamber, (d) performing microbial treatment in an aerobic tank, (f) precipitating the sludge in a precipitating tank and allowing a portion of the sludge from the precipitating tank to the anaerobic tank, and (h) activating microorganisms in a precipitated sludge in an activating tank.    USE - The method is useful for treating wastewater (claimed).    ADVANTAGE - The method reduces water pollution, removes bad odor and nutritive salts and organic materials, enhances activity of B.subtilis strain GU01, and increases biochemical oxygen demand (BOD) and chemical oxygen demand (COD).    DETAILED DESCRIPTION - Method for treating wastewater, involves (a) inflowing wastewater including sewage, effluent and wastewater containing excrements of livestock to the water collecting tank, (b) inducing release of phosphorus in anaerobic tank, (c) performing denitrification in an anoxic chamber, (d) performing microbial treatment in an aerobic tank, (f) precipitating the sludge in a precipitating tank and allowing a portion of the sludge from the precipitating tank to the anaerobic tank, and (h) activating microorganisms in a precipitated sludge in an activating tank, and allowing a portion of the sludge from the activating tank to at least one of the water collecting tank, anaerobic tank, anoxic chamber, and aerobic tank, where the plant extract is added into at least one of water collecting tank and aerobic tank, and Bacillus subtilis strain GU01 (KCCM 10890P) is injected into the aerobic tank. An INDEPENDENT CLAIM is included for wastewater treatment apparatus, which comprises water collecting tank, anaerobic tank, anoxic chamber, aerobic tank, precipitating tank and activating tank for performing the above-mentioned method.