The present invention provides a will-expression modeling device simulating human will-expression responding to an direction input given from the outside, which includes an interest interpretation section, an emotion creating section and a will-expression section. The interest interpretation section collates the direction input with a predetermined hedonic interest relationship table and outputs a mood factor representing pleasure, displeasure or the like. The emotion creating section prepares a plurality of emotional states obtained by modeling human emotions as data and causes state transitions to occur in the emotional states according to the mood factor to simulate a change in human emotion responding to the direction input. The will-expression section prepares in advance a plurality of mental-will states obtained by modeling human will as data and selects a new mental-will state from the emotional states or a “combination of a mental-will state and an emotional state”.
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