NAVIGATION SYSTEM AND PORTABLE TERMINAL APPARATUS

摘要

PROBLEM TO BE SOLVED: To correctly navigate a user to destination, and to elongate operation time even at any situation by surely reducing the consuming power for positioning process. SOLUTION: A mobile terminal 200 provided with navigation function comprises: a guiding route acquisition means for acquiring the guiding route from the departure point to the destination; a positioning timing determination part 271 for determining whether positioning timing becomes preferable or not in the vicinity of a predetermined guide point on the guiding route; and a positioning process part 272 for processing the positioning of the present position using the GPS satellite only when determined that the positioning timing becomes preferable. COPYRIGHT: (C)2008,JPO&INPIT