NOVELTY - Cellulose saccharification apparatus, comprises enzymatic reactor (4) for degrading cellulose using diastatic enzyme, and first catalytic reactor (5) for degrading degradation product produced by the enzymatic reactor into glucose using a solid acid catalyst.    USE - The cellulose saccharification apparatus is useful for degrading cellulose to produce glucose. The biomass saccharification apparatus is useful for degrading hemicelluloses into cellulose. The fermentation apparatus is useful for producing fermented products from glucose (all claimed). The fermented product is ethanol.    ADVANTAGE - The cellulose saccharification apparatus, biomass saccharification apparatus and fermentation apparatus are cost-effective and enable to reuse solid acid catalyst.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) biomass saccharification apparatus comprising a pressurized hot water reactor (1) for selectively degrading hemicellulose contained in biomass by allowing pressurized hot water to act on the biomass, solid-liquid separator (2) for separating cellulose as a solid from a treated liquid of the pressurized hot water reactor, and the cellulose saccharification apparatus for degrading cellulose separated by the solid-liquid separator into glucose;    (2) fermentation apparatus comprising the above-cited biomass saccharification apparatus, first fermenter (6) for producing fermentative products from glucose produced by the biomass saccharification apparatus, and second fermenter (8) for producing fermentative products from a hemicellulose- derived monosaccharide produced by the biomass saccharification apparatus; and    (3) cellulose treatment method, involves performing enzymatic reaction process for degrading cellulose using diastatic enzyme, and solid acid catalytic reaction process for degrading the degradation product produced by the enzymatic reaction process into glucose using solid acid catalyst.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of fermentation apparatus.    Pressurized hot water reactor (1)    Solid liquid separator (2)    Cooler (3)    Enzymatic reactor (4)    First catalytic reactor (5)    First fermenter (6)    Second catalytic reactor (7)    Second fermenter (8)