NOVELTY - A methane fermentation treatment method involves calculating real production value of gas which produced organic waste of first supply amount which is supply amount of organic waste with respect to fermenter in first batch, computing estimation production value of gas which produces organic waste of second supply amount which is supply amount of organic waste with respect to fermenter in second batch following first batch, and calculating real production value of gas which produced organic waste of second supply amount after supplying organic waste of second supply amount to fermenter.    USE - A methane fermentation treatment method for obtaining organic waste gas as biomass energy.    ADVANTAGE - The method grasps state of methane fermentation without using special measurement apparatus, and attains stabilization of methane fermentation even when characteristic change of organic waste is large.    DETAILED DESCRIPTION - A methane fermentation treatment method involves calculating real production value of gas which produced organic waste of first supply amount which is supply amount of organic waste with respect to fermenter in first batch, computing estimation production value of gas which produces organic waste of second supply amount which is supply amount of organic waste with respect to fermenter in second batch following first batch, calculating real production value of gas which produced organic waste of second supply amount after supplying organic waste of second supply amount to fermenter, comparing estimation production value and real production value of second batch, determining third supply amount which is supply amount of organic waste with respect to fermenter in third batch, and comparing real production value of first batch with real production value of second batch. An INDEPENDENT CLAIM is included for a methane fermentation treatment apparatus comprising:    (1) measurement unit which measures real production value of gas produced in fermenter (25);    (2) storage unit which stores real production value of gas measured by measurement unit and produced organic waste of first supply amount which is supply amount of organic waste with respect to fermenter in first batch;    (3) calculation unit which computes estimation production value of gas which produces organic waste of second supply amount which is supply amount of organic waste with respect to fermenter in second batch following first batch; and    (4) arithmetic processing apparatus (24) which has comparison unit which compares real production value of gas which produced organic waste of measured second supply amount with estimation production value of second batch and real production value of first batch.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the methane-fermentation treatment apparatus.    Storage tank (21)    Mixing apparatus (23)    Arithmetic processing apparatus (24)    Fermenter (25)    Measurement apparatus (F1)