NOVELTY - A methane is concentrated by alternately supplying source gas containing methane, nitrogen and oxygen to two adsorption columns using source gas compressor (1), performing adsorption process of pressurizing the adsorption column and regeneration process of pressure-reducing adsorption column, and filling 1st adsorption column (2A) with larger adsorption agent than the amount of equilibrium adsorptions of objective component with 2nd amount of equilibrium adsorptions of objective component with equivalently 1st adsorption rate of 1st objective component and 2nd objective component.    USE - Concentration process of methane (claimed).    ADVANTAGE - Concentration of methane is high. Methane recovery can be maximized.    DETAILED DESCRIPTION - A methane is concentrated by alternately supplying source gas containing methane, nitrogen and oxygen to two adsorption columns using source gas compressor (1), performing adsorption process of pressurizing the adsorption column and regeneration process of pressure-reducing adsorption column, filling 1st adsorption column (2A) with larger adsorption agent than the amount of equilibrium adsorptions of objective component with 2nd amount of equilibrium adsorptions of objective component with equivalently 1st adsorption rate of 1st objective component and 2nd objective component, filling 2nd adsorption column (2B) with larger adsorption agent than the adsorption rate of objective component with 2nd adsorption rate of 1st objective component, concentrating 1st objective component as 1st product gas and 2nd objective component as 2nd product gas, and returning the gas discharged from source gas introduction side of adsorption column in regeneration process to source gas inlet side of source gas compressor.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the concentration process of the methane. (Drawing includes non-English language text).    Source gas compressor (1)    1st adsorption column (2A)    2nd adsorption column (2B)    Valve (5a)    Product tank (13A, 13B)