FIG. 4 shows a state in which data such as vectors (a) [a0, a1, a2, . . .], vectors (b) [b0, b1, b2, . . .], and the like is allocated to continuous areas in the RAM 422 by the method of allocating the continuous addresses to the same RAM. By such an address allocating method, the data of the vectors (a) or the data of the vectors (b) can be read out from the memory cells to the data buffers 50 to