To surely collect and control operation information of an operation device like a working machine, etc.
An alternator 24, an hour meter 26, a liquid level sensor 28 and a pressure switch 30 are connected wit a machine body controller 14, where operation information to be outputted from each of them is inputted when the operation device is operated. The operation information is temporarily stored from the machine body controller 14 in a RAM 163 of a working controller 16, is simultaneously transmitted from the working controller 16 to a starting key 10, while the operation information stored in an EEPROM of the starting key 10 is updated whenever a prescribed time passes. The operation information stored in the starting key 10 is transmitted from the starting key 10 to a fetching device 18 at a state that the starting key 10 is inserted into an outlet 180, a data processing is performed for the transmitted operation information by a processor 20 and the processed operation information is displayed on a display part 202.
KOBE STEEL LTD