Abstract: An approximated objective function value calculator calculates individual estimated values for an evaluation parameter corresponding to individual values of a controlled parameter where the value of a non-controlled parameter is held constant at the current value in an approximated objective function estimated by an approximated objective function estimator. A proximity distance calculator calculates, as a proximity distance s for each individual value for the controlled parameter, a distance from each individual value for the controlled parameter, in a case where the value of the non-controlled parameter is held constant, to the analysis data having the nearest distance when projected onto an input variable space defined by the controlled parameter and the non-controlled parameter. An additional measurement point determining indicator calculator calculates an additional measurement point determining indicator P corresponding to each individual value of the controlled parameter as P=estimated value??×s.