ROBOT APPARATUS, CONTROL METHOD THEREOF, AND METHOD FOR JUDGING CHARACTER OF ROBOT APPARATUS

In a robot apparatus and a control method thereof, first, the state space of a motion model is expanded/contracted partially or entirely; second, a transition to a specified node of the motion model is described as transition to a virtual node and the node group assigned to the virtual node is changed sequentially; third, the number of emotions and/or desires used for generation of a motion is increased/decreased gradually; and last, the environment is evaluated and the sensitivity to each emotion and/or desire is updated based on the evaluation results. In a robot apparatus and a method for judging the character thereof, a pet robot comprises means for detecting the output from a second robot, means for judging the character of the second robot based on the detection results, and means for varying the character based on the judgment results.