Patent ID: 8892517

Claim:
A data updating system comprising: a server that creates a differential data file for updating a navigation device, the differential data file containing road network data arranged by data types and guidance data that is linked to the road network data; and the navigation device comprising: a communication device for communicating with the server to receive the differential data file; a navigation memory storing: a local database organized in an updating data format in which the road network data is arranged in an order of the data types and which is updated with the road network data in the differential data file, the local database containing no guidance data; and a referential database that organizes the road network data and guidance data in a reference data format in which the road network data is arranged in the order of connection of the road network; and a navigation controller that: converts data stored in the local database so as to have the reference data format by changing an order of the data from the order of the data types to an order in connection of the road network so that, in the converted data, the road network data is arranged in the order of connection of the road network; stores the converted data in a temporary storage area; and updates the road network data in the referential database with the converted data; and updates the guidance data in the referential database directly based on the differential data file.