A recording medium stores a program causing a computer to execute determining, for each test pattern measuring operation frequency of a circuit and based on a predicted delay of each path in the circuit, a path candidate determining a measured value obtained via the test pattern and activated by the test pattern; building, for each test pattern yielding a measured value determined by a given path candidate determined at the determining, a model equation expressing discrepancy between the measured value obtained via the test pattern and the predicted delay of the given path candidate, the model equation including parameters representing effects of each path activated by the test pattern on the discrepancy; calculating values of the parameters by using the model equations; determining based on the calculated values, a path determining the measured value obtained via the test pattern and activated by the test pattern; and outputting the determined path.