Information terminal and cartographic information providing system

An information terminal (1) is provided with a first input section (11), a position detector (12) , a first arithmetic operation section (13) , a data storage section (15) , a first data reader (18) , a connection information generator (17) , and a first output section (16). The data storage section (15) stores cartographic data having the data structure simplified but capable of recovering information about connection among nodes and links constructing a road network. The connection information generator (17) complements the connection information of the cartographic data.. The first arithmetic operation section (13) uses the connection information complemented by the connection information generator (17) to carry out data processing for various purposes, such as route search and position detection.