NOVELTY - Organic waste (1) is fed to methane fermentation in fermenter (5). Membrane pervious liquid is removed by solid-liquid separation of fermentation sludge. Surplus fermentation sludge is removed from tank. Biogas production accumulated total amount or average amount are obtained as control parameter. Adjustment of extracting amount of pervious liquid is based on change in material input amount, which is based on control parameter value.    USE - For film-type methane fermentation processing of organic waste.    ADVANTAGE - The organic waste is efficiently fermented by uniformly maintaining total solid concentration in methane fermentation tank, and injection load. The concentration of methanation microbe is stabilized.    DETAILED DESCRIPTION - The organic waste (1) is supplied as a raw material to a fermenter (5), and methane fermentation is carried out. The membrane pervious liquid is removed from tank by solid-liquid separation of fermentation sludge with a membrane separator (11). The surplus fermentation sludge in the fermenter is removed from the tank. The biogas (18) amount produced with the fermenter is measured. The biogas production accumulated total amount, which is the production total amount within control cycle time, or biogas production average amount, which is an average generation amount per unit time within control cycle time, are obtained as control parameter. The extracting amount of the surplus fermentation sludge at constant rate is initially set. The increase and decrease of material input amount to the fermenter of adjustment is carried out for every control cycle time, based on the control parameter value, such that the biogas amount of control parameter optionally serves as target value. Increase and decrease of extracting amount of membrane pervious liquid of adjustment is carried out based on the change in material input amount. Thus, film-type methane fermentation processing method is enabled.    An INDEPENDENT CLAIM is included for film-type methane fermentation processing apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows the film-type methane fermentation processing apparatus. (Drawing includes non-English language text).    raw material (1)    crusher (2)    methane fermentation tank (5)    membrane separation tank (11)    biogas (18)