There is provided a will expression model device for simulating a human will expression answering an instruction input give from outside. The will expression model device includes an interest interpretation unit, a feeling generation unit, and a will expression unit. The interest interpretation unit correlates the instruction input with a predefined pleasant/unpleasant table and outputs a feeling factor indicating pleasant/unpleasant feeling or the like. The feeling generation unit prepares as data a plurality of feeling states in which the human feelings are modeled and changes the feeling state according to the feeling factor, thereby simulating the human feeling change according to the instruction input. The will expression unit prepares in advance as data, psychological will states in which human will is feeling-modeled and selects a new psychological will state from a feeling state or "a combination of the psychological will state and the feeling state". ® KIPO & WIPO 2007
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