ON-VEHICLE INFORMATION PROCESSOR WITH MAP DATA AND MAP MANAGEMENT

摘要

PURPOSE: An on-vehicle information processor is provided to improve the efficiency in processing application by eliminating map data with low possibility of access from an application processing member. CONSTITUTION: An on-vehicle information processor for providing map information based on map data includes an application processing member(12-14), a data reading unit(23), a data management unit(24), a request analyzing unit(22). The application processing member provides predetermined map information based on map data(31) and map management data(32). The data reading unit reads the map data and the map management data. The data management unit manages independently the map data the map management data. The request analyzing unit responds to access request form the application processing member and allows the access from the application processing member to the map data and the map management data managed by the data management unit. The data management unit has a map data cache for storing the predetermined number of map data, and a control unit for controlling the map data cache. The control unit limits an amount of the map data stored in the map data cache in a predetermined upper limit.