A system includes a sensor section which receives fuzzy information inputs X containing a plurality of components and converts the plurality of components into a plurality of measurable input physical quantities, a converter which receives a plurality of input physical quantities and converts the input physical quantities into a plurality of pulses having pulse widths corresponding to the magnitudes thereof, and a feature extraction section (NF) which receives a plurality of pulses, selects the plurality of pulses by using a set pulse width as a reference, and extracts feature information items y0, y1, y2, . . . which express the features of the fuzzy information inputs X from the fuzzy information inputs X according to the number of selected pulses.