To solve a simultaneous primary equation while using minimum memory capacitance within a range where calculation time is not almost changed and calculation performance is not rapidly changed.
A simultaneous primary equation solving device 101 with input/ output functions is provided with a work area calculating processing part 102 for outputting required memory capacitance to be a threshold value, with which the calculation time is rapidly changed, from a coefficient matrix A as one of input information 107 to work area information 108, work area designating information 109 for designating the required memory capacitance optimal for a computer environment from the threshold value of the reported required memory capacitance, a triangular solving processing part 105 and a forward/ backward substituting processing part 106 for solving the simultaneous primary equation from the information designated in the work area designating information 109 according to a system of allocation to the memory of the work area registered in a processing class managing table 112.
SAITO AKIYOSHI
TANAKA SHINICHI
IOGI NOBUHIRO
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