To study about a creation of an action, we must study the mental and physical functions that create the action. Therefore, we focused on a rhythm controller that incorporated ambiguity in the relationship between the controller input and avatar motion, because determining this relationship requires the involvement of both mental and physical functions. In this study, we examined how controller manipulation methods changed when subjects performed similar avatar movements in different situations using the rhythm controller. From the results, we show that a regression plane by which the controller manipulation method (the relationship between the controller input and avatar motion) is approximated varies with the situation. Furthermore, we found that differences in intention could be expressed in the controller manipulation method. These show that the controller manipulation method of the rhythm controller flexibly changes depending on the situation, and is closely connected with the meaning of the action.