IN-VEHICLE APPARATUS AND MAP DATA MANAGEMENT SYSTEM

An in-vehicle apparatus and a map data management system are provided that can appropriately update a map. The in-vehicle apparatus includes a storage unit that stores parcel data PD constituted by a plurality of files in accordance with meshes of the map, and a control unit that, when a vehicle enters a single mesh of the map, updates the version of lower-level parcel files DPF corresponding to meshes at the periphery of the single mesh.