Abstract: Measurement data (raw data) transmitted via a network is received by a sensor data obtainment unit, a sensor ID is extracted from the received data and is provided to an ID data detection unit, the ID data detection unit provides detected ID data to an ID retrieval unit, and the ID retrieval unit retrieves an ID table and extracts a company name and a sensor type by using the sensor ID as a key. A calculation expression file and a parameter file are referred to on the basis of the extracted company name and sensor type, data obtained by referencing is provided to a data processing unit and/or a data correction unit, and the received measurement data is corrected to significant measurement data. A process result is provided to an external user from a signal processing unit via a measured value file.