PROBLEM TO BE SOLVED: To calculate a response surface capable of calculating a plurality of objective variables so as to satisfy a prescribed relation when there is the prescribed relation among the plurality of objective variables.;SOLUTION: A response surface calculation program 330a calculates, in each of a plurality of first response surfaces, a plurality of combinations of values of multiple kinds of explanatory variables used in the calculation of an approximate value of different kinds of objective variables; calculates, for each combination, a combination of values of additional variables of the same number of kinds as the number of kinds of objective variables; calculates, for each of the combination of values of explanatory variables and the combination of values of additional variables, an approximate value of different kinds of objective variables from the combination of values of the explanatory variables by using each of the first response surfaces; calculates an approximate value of a new objective variable indicating any of the objective variables in accordance with the combination of values of the additional variables; and calculates, on the basis of the combination of values of the multiple kinds of explanatory variables, the combination of values of the additional variables, and the approximate value of the new objective variable, a second response surface satisfying a prescribed relation among the different kinds of objective variables differing in relationship among the approximate values.;COPYRIGHT: (C)2015,JPO&INPIT
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