To provide a game device which can realistically express the motions of game characters, and to provide a controlling method and a program for the game device.

A combining ratio calculating section 111 calculates a combining ratio for combining a walking motion and a running motion conforming to formula (1) (not shown in formula). Then, a basic moving distance calculating section 112 calculates a basic moving distance of the motions formed by the combination conforming to formula (2) (not shown in formula), and then, a motion unit time calculating section 113 calculates a motion unit time. A posture data acquiring section 114 acquires RUN posture data and WALK posture data formulae (3) and (4) (not shown in formulae), and a combined posture data forming section 115 forms combined posture data conforming to formula (5) (not shown in formula).