A voice recognizing apparatus includes a filter bank for deriving feature parameters of voice from a microphone and a filter bank for deriving feature parameters of noise represented by an electric signal which is directly inputted to a terminal. Further, a first control device is mounted and concealed between the first and second frames in order to prevent the user from inadvertently colliding with it. The method includes mirroring the remote procedure call cache of the first storage node in a mirrored remote procedure call cache of a second storage node. One or more cameras and sensors may be utilized to aid operation by providing the operator with information about depth, distance, and positioning.