Map data distribution system and map data updating method

• Main Authors: NAKA KENJI, INAYOSHI HIROKAZU, MORIOKA MICHIO, ASAHARA AKINORI, TANABATA TAKANARI
• Format: Patent
• Language: Chinese; English
• Published: 26.01.2011
• Subjects: ADVERTISING; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE; CRYPTOGRAPHY; DIAGRAMS; DISPLAY; EDUCATION; EDUCATIONAL OR DEMONSTRATION APPLIANCES; GLOBES; GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; PLANETARIA; SEALS; SIGNALLING; SURVEYING; TESTING; TRAFFIC CONTROL SYSTEMS

The invention provides a map data distribution system and a map data updating method. In a navigation system, stop time of navigation function when updating the map data is reduced. The map data distribution system includes a server which distributes map data and a mobile terminal which receives the map data. The server stores, for each area, the difference data between pieces of map data obtained before and after updated, and sends the difference data of map data of an area requested by the mobile terminal to the mobile terminal. The mobile terminal includes a database for storing map data and an updated-data store part for storing updated map data, generates updated data by using the received difference data, stores the updated data in the updated-data store part and then in the database. In order to fetch map data while the updated data are being stored from the updated-data store part to the database, when the map data to be fetched are stored in the updated-data store part, the mobile terminal fetches th