1. A method for use in operation of a game apparatus for determining a lack of user activity in relation to the game apparatus, comprising the steps of: obtaining information usable to determine an activity level of a user of the game apparatus, wherein the information comprises at least two of inertial tracking information, image tracking information, and acoustic tracking information; mixing the at least two of inertial tracking information, image tracking information, and acoustic tracking information to generate position and orientation information; processing the position and orientation information to determine whether the user is currently inactive; and controlling the operation of the game apparatus when the step of processing the position and orientation information determines that the user is currently inactive.