There is provided a will expression model device for simulating a human willexpression answering an instruction input give from outside. The willexpression model device includes an interest interpretation unit, a feelinggeneration unit, and a will expression unit. The interest interpretation unitcorrelates the instruction input with a predefined pleasant/unpleasant tableand outputs a feeling factor indicating pleasant/unpleasant feeling or thelike. The feeling generation unit prepares as data a plurality of feelingstates in which the human feelings are modeled and changes the feeling stateaccording to the feeling factor, thereby simulating the human feeling changeaccording to the instruction input. The will expression unit prepares inadvance as data, psychological will states in which human will is feeling-modeled and selects a new psychological will state from a feeling state or ~acombination of the psychological will state and the feeling state~.
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