SYSTEM FOR DISTRIBUTING MAP INFORMATION AND TERMINAL DEVICE

摘要

PROBLEM TO BE SOLVED: To avoid such a problem that map information can not be obtained when the communication by a radio communication system is unavailable in the case the map information is obtained using the radio communication system. SOLUTION: A car navigation terminal device 101 stores area information (information of unavailable communication area), which is not a communication service area of the radio communication system, into a section for storing information of unavailable communication area 118, and refers the stored information of unavailable communication area when the calculation of route is carried out. In the case an unavailable communication area on the route obtained by the calculation of route is detected, map information corresponding to the unavailable communication area is obtained from an information service center 106 before arriving at the detected unavailable communication area.