An external tank has a biological destructive lighting system mounted perpendicularly to an electrolytic device within an externally mounted pipe. The lowest available conveying capacity of the conveyors and buffer capacity of the bunker units are determined based on continuously detected actual data and are compared in a computer-aided control unit to at least one of current actual extraction output, anticipated target extraction output, and scheduled output extrapolated from past actual data. The service providing server 20 calculates a second hash value from the login information using the same hash function if the login information transmitted from the authentication server 10 matches information that is registered in advance. In operation, the asymmetric FET is turned off when the electronic circuit is placed in a standby state and, due to the low off current, effectively reduces standby leakage current from the electronic circuit.