The local error estimation unit (515) of the local error generation device (500) includes the global error (δo, δt, δb) included in the positioning reinforcement information (81) created by the electronic reference point network (120), and the electronic reference A local error (δT, δI) is estimated and generated based on the observation data (61) generated by the receiver of the electronic reference point (611, 612) not belonging to the point network (120). The local errors (δT, δI) are errors that affect the positioning accuracy in the area where the electronic reference point (611, 612) exists, and are errors that depend on the area where the electronic reference point (611, 612) exists.
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