When the engine is in a specified operation state in which the EGR valve is brought into the full-close condition, the holding force for holding the EGR valve at the full-close position is corrected by correcting the control duty signal of the EGR valve. The customer managing device specifies a copying machine adapted to the advertisement request, and advertisement contents requested to be advertised are transmitted to the specified copying machine. In this regard, events can be defined and, thereafter, detected based on inactions of a user.