An observation signal information determination apparatus that determines a number of observation signals to be observed for obtaining an operation parameter of a circuit, characterized in that the apparatus comprises: an observation signal information determining means that determines the number of the observation signals, based on: information on an implementable area that may be implemented on a circuit implementation device, information on an area in case of the circuit being implemented by the circuit implementation device, and information on a circuit area necessary for each of the observation signals, wherein the observation signal information determining means determines a value obtained by subtracting the information on the area in case of the circuit being implemented by the circuit implementation device from the information on the implementable area that may be implemented on the circuit implementation device as information on a surplus circuit scale, and determines the number of the observation signals based on a value obtained by dividing the information on the surplus circuit scale by the information on the area of an operation parameter measuring circuit per observation signal, the operation parameter measuring circuit measuring the operation parameter. an observation signal information determining means that determines the number of the observation signals, based on: information on an implementable area that may be implemented on a circuit implementation device, information on an area in case of the circuit being implemented by the circuit implementation device, and information on a circuit area necessary for each of the observation signals, wherein the observation signal information determining means determines a value obtained by subtracting the information on the area in case of the circuit being implemented by the circuit implementation device from the information on the implementable area that may be implemented on the circuit implementation device as information on a surplus circuit scale, and determines the number of the observation signals based on a value obtained by dividing the information on the surplus circuit scale by the information on the area of an operation parameter measuring circuit per observation signal, the operation parameter measuring circuit measuring the operation parameter. information on an implementable area that may be implemented on a circuit implementation device, information on an area in case of the circuit being implemented by the circuit implementation device, and information on a circuit area necessary for each of the observation signals, wherein the observation signal information determining means determines a value obtained by subtracting the information on the area in case of the circuit being implemented by the circuit implementation device from the information on the implementable area that may be implemented on the circuit implementation device as information on a surplus circuit scale, and determines the number of the observation signals based on a value obtained by dividing the information on the surplus circuit scale by the information on the area of an operation parameter measuring circuit per observation signal, the operation parameter measuring circuit measuring the operation parameter.