A kind of EoD systems can be easily introduced the personal daily life activity of consideration. Current electric power value, receive the tap 11 from smart card, be using equipment q estimation (one) from current electric power value change, utilization obstacle is detected as event, when utilization obstacle is different from event e { q ' → q } and time of origin and being stored in memory 10. in the type of the previous time using q 'In then, first weight p (q ' → q | t, 1) calculating of the event e of stir yourself type is based on electric appliance function model table (1) 12b and passes through time and the time of origin with event, and the second weight p (q | 1) it obtains to the equipment that each living body activity corresponds to currently used state q from electric appliance function model table (2) 12c. It is to calculate each utensil and stir yourself label multiplied by the product of the first weight and the second weight and wavelength based on product, each equipment of the sum of medium wavelength product value becomes maximum value, to estimate as its time t of living body active tags.
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