A disclosed method includes: converting, for each sample point, a set of performance item values for a sample point into coordinate values of a mesh element containing the set among plural mesh elements obtained by dividing a space mapped by the performance items; generating a binary decision graph representing a group of the coordinate values of the sample points; calculating the number of sample points including second sample points that dominates a first sample point and the first sample point, by counting the number of paths in the binary decision graph from a root node to a leaf node representing “1” through at least one of certain nodes corresponding to coordinate values that are equal to or less than coordinate values of the first sample point; and calculating a yield of the first sample point by dividing the calculated number by the number of the plural sample points.