CENTER LINE SIMPLIFICATION DEVICE, NETWORK DATA GENERATION SYSTEM AND PROGRAM

Centerlines for generating network data of an indoor space can be simplified while the amount of calculation is limited. A centerline simplification unit 240 performs processing of deleting centerlines of passages that are movable regions in an indoor space and processing of correcting centerlines. A determination unit 242 determines whether or not the simplification has ended based on the number of centerlines or the number of vertices connecting the centerlines.