1. A computer-readable, non-transitory medium storing therein a failure diagnosis support program that causes a computer to execute a procedure, the procedure comprising: determining, for each test pattern used to measure operation frequency of a circuit subject to diagnosis, a path candidate that determines a measured value obtained via the test pattern, the path candidate being among a group of paths activated by the test pattern and determined based on a predicted delay of each path in the circuit; building, for each test pattern yielding a measured value that is determined by a given path candidate among path candidates determined at the determining, a model equation expressing a 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 between the measured value obtained via the test pattern and the predicted delay of the given path candidate; calculating values of the parameter by using the model equations built at the building; determining from among the group of paths activated by the test pattern and based on a calculation result obtained at the calculating, a path that determines the measured value obtained via the test pattern; and outputting a determination result obtained at the determining a path.