NOVELTY - Organic substance in organic waste is decomposed in a decomposition installation at 60 degrees C or more of an aerobic atmosphere with hyperthermophilic anaerobic bacteria. The obtained decomposed product is sent and processed in methane fermentation installation under anaerobic temperature.    USE - Organic waste processing system.    ADVANTAGE - Processing system excels in decomposition ratio of the organic substance.    DETAILED DESCRIPTION - Organic substance in organic waste is decomposed in a decomposition installation at 60 degrees C or more of an aerobic atmosphere with hyperthermophilic anaerobic bacteria. A solid-liquid separator is provided between decomposition and methane fermentation installation. The surplus sludge in methane fermentation installation is supplied to decomposition installation. A water treatment plant is installed at later stage of methane fermentation installation. A solid-liquid separator is arranged between methane fermentation installation and water treatment plant so that the separated solid content is supplied to methane fermentation installation while the liquid is sent to water treatment plant. Surplus sludge of water treatment plant is supplied to both installations. Surplus sludge of both installations are supplied to the water treatment plant. The solid-liquid separator to separate the contents of hyperthermophilic anaerobic bacteria production facility, is provided. A supply unit supplies organic waste to methane fermentation installation and to the water treatment plant. An ammonia recovery equipment is attached to decomposition installation. A methane generated within the methane fermentation installation is applied to a cogeneration installation which ejects exhaust heat of more than 60 degrees. The decomposition installation is maintained at temperature of 60 degrees or more. The organic substance in solid organic waste is solubilized using the bacteria. The decomposition ratio of the organic substance in the organic waste is 60% or more. The contents of the decomposition installation has pH value of more than 7.    INDEPENDENT CLAIMS are also included for the following:    (1) organic waste processing apparatus; and    (2) preprocessing method of organic waste    DESCRIPTION OF DRAWING(S) - The figure shows the organic waste processing system. (Drawing includes non-English language text).