The present invention provides an LCD panel driving apparatus capable of inexpensively and precisely performing DC-free AC driving of an LCD panel, as well as an LCD apparatus to be driven by such driving apparatus. Such a method and system is adapted to collect and make available network session status information and to collect and make available network user status information. The selected volume can be presented as a perspective image rotating around a basic rotational axis. When one sheet of the reinforcing membrane is buried, the reinforcing membrane is offset to the anode side to be buried in the electrolyte resin. In mounting the rotor onto the housing, the retaining portions contact the slanted surface and the arms are elastically deformed.