In an operation method of marker system (1) in which laying position information indicating a position where a magnetic marker (10) is laid is provided to a vehicle (3) side for achieving control for assisting driving of the vehicle (3) by using the magnetic marker (10), since positional accuracy required when laying magnetic markers (10) can be relaxed, the laying position information of the magnetic marker (10) positioned on the vehicle (3) side which performs the control for assisting driving is used as correction information to correct the laying position information indicating the position where the magnetic marker (10) is laid, and laying cost of magnetic markers (10) can be suppressed.