A marker for marking a ground surface is disclosed, and includes a shaft having a bottom end and a top end. Upon receipt of a location registration or outgoing call request from a subscriber, a Mobile Switching Center transmits a location registration or outgoing call request message to a corresponding one of the managed intelligence nodes. Lowest reading rate information indicates a minimum requirement of a reading rate for the information reproducing apparatus to reproduce a reproduction unit, which comprises at least one of the first data groups and which is to be reproduced by the information reproducing apparatus such that a sequential logical meaning of the reproduction unit is continuous. The switch reluctance device is operated in an electrical power generating mode when the internal combustion engine is operating above a predetermined operating speed. When the second controller receives the signal sent from the detecting section in a power saving state in which power is supplied from the power supply to the second controller, the power saving state is changed to a power supplying state capable of image capturing by supplying power from the power supply to portions of the device including the first controller.