PURPOSE: To perform a right and proper guide notification even when a mobile object such as a sightseeing bus, etc., selects any route and the mobile object approaches the object of sightseeing guide from any direction.

CONSTITUTION: The present location of a mobile object is specified by a navigation system 1, and an arithmetic part 8-1 deciding that this attains the guide start point of an important position which is apart from the fixed point in the vicinity of the guide object stored in a guide data storage medium 10 by referring to a set value and information specifying a directional phrase from the guide data storage medium 10 when that the mobile object attains the guide start point is decided by this arithmetic processing part 8-1 are acquired. Based on this information, the directional phase is notified by a speaker 13, and the guide data is acquired from a guide data storage medium 10. Based on this data, the guide on the guide object is notified by the speaker 13.