The present invention makes it possible to easily perform judgment of a mental-and-physical state, and distinction between a person and a thing. A load body state is judged from time series data of an emphasis displacement inclination obtained by collecting displacement signal data of the load body state using a displacement signal collection sensor 10, determining a rate of change for every arbitrary interval of an original waveform as an original waveform displacement inclination at an operating unit 20, and at the same time, determining time series data of an average displacement inclination for every prescribed time period range from a plurality of original waveform displacement inclinations, and by determining an emphasis displacement inclination through slide calculation of time series data of the average displacement inclination for every prescribed sampling time. Accordingly, it is possible to obtain time series data in which wobbling-like fluctuation peculiar to a low frequency living body displacement signal is emphasized by determining an emphasis displacement inclination from an original displacement inclination and an average displacement inclination even when vibration or the like transmitted from a road surface during traveling of a car is contained in the displacement signal data collected by the displacement signal collection sensor 10.
