Patent ID: 7082366
Filing Date: 2006-07-25
Classification: G08G

Abstract:
1. A communication method in a communication terminal apparatus mounted in a mobile unit, the communication terminal apparatus comprising a communication unit, a route information acquiring unit which acquires driving route information based on a driving route calculated by an information center from the information center through the communication unit, and a guiding unit which guides a route based on the driving route information acquired by the acquiring unit, the method comprising: predicting a possibility for the mobile unit to deviate from the driving route shown by the acquired driving route information, controlling the communication unit to begin establishing a connection to the information center when it is predicted there is a possibility for the mobile unit to deviate from the driving route, and transmitting route calculation request information for calculating a new driving route to the information center only when the mobile unit deviates from the driving route after the establishing of the connection to the information center has begun.