Disclosed is a system in which in order to obtain the operation parameter of a circuit based on an implementable area indicating a circuit scale that can be implemented on a circuit implementation device, circuit area information, and operation parameter measuring circuit area information, an observation signal number determining means determines observation signal information on a circuit that obtains the operation parameter of the circuit. The number of the extracted signals is determined in view of the area that can be implemented on a digital LSI or an emulator and the area of the circuit to be implemented (refer to FIG. 1).