Disclosed herein is an electrode for energy devices such as electric double layer capacitors, which includes conductive fibers made of carbon, such as carbon nanotubes, as an electrode active material and has a high capacitance. An envelope signal generation unit is configured to generate an envelope signal from the signal read by the optical pickup. The maximum input value provides the value of the input signal that approximately corresponds to a maximum operating level of the vehicle engine. The edge node that receives the data routed by the routing node, transmits the data to the mobile station corresponding to the IP address of the mobile station added to the data. The help system then displays the derivation to the user.