An apparatus and method for splitting vertex streams relating to graphics data into substreams, and processing the substreams in parallel. The result of the high-precision radio-wave propagation characteristic evaluation to be made after this addition is put to practical use for estimating an interference quantity in selecting the arrangement location of the base station to be added newly. By adopting the above method, the disturbance to effective signal by noise can be eliminated. To the adjusted brown grease phase an anionic copolymer treatment mixture is added along with a cationic copolymer to form a reaction mixture. The receiver includes a detector, an inverter, and a decoder. Moreover, an offset current is pulled from a detection input of the double sample amplifier in order to generate a more accurate DC output voltage.