A waste treatment facility 100 is constructed in vicinity of a cement production facility 200. This comprises: a gasification furnace 1 for gasifying waste to generate a pyrolysis gas; and a gas transport line 6 for transporting the pyrolysis gas generated in the gasification furnace 1 to a calciner 20 or the like in the cement production facility 200 while containing entrained char and ash, The flow rate of the pyrolysis gas from the gasification furnace 1 is limited to a level below a predetermined flow rate ratio over the flow rate of the exhaust gas from the calciner 20 to reduce the fluctuation of the temperature in the calciner 20, so that the stability in the operation of the cement production facility 200 is ensured. The pyrolysis gas may be introduced to the calciner 20 from the gas transport line 6 so as to swirl along the peripheral wall section 23.