MAP DATA PRODUCT AND MAP DATA PROCESSOR

A data product that can be read into a computer or a map data processing apparatus contains map data that includes map-related information related to a map. The map data includes: a structure achieved by dividing the map into a plurality of mesh-like subdivisions and dividing the map-related information into units corresponding to the individual subdivisions; and a structure in which the map-related information is managed in units of subdivision sets each containing a plurality of adjacent subdivisions and the map-related information is used in the map data processing apparatus in units of the individual subdivision sets.