| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently exercise navigation functions using a small portable terminal. SOLUTION: The communication center device 15 is provided with functions provided in a navigation device such as signal processing of positional information and moving speed, data base retainment for maps and addresses, route search, and vocal guidance, and by communicating with the communication center device 15 through a portable telephone or a PHS 1, signal processing and a data amount of a terminal device main body 7 of the mobile terminal device side can be substantially reduced for enabling reduction of size and weight of the mobile terminal device. |
