Patent ID: 8494769

Claim:
An information system including a terminal device and an information center device, the terminal device provided in an inside of a vehicle and comprising: a terminal control unit for transmitting information on a departure place, a destination, and generation information of block maps stored in the terminal storage unit to the information center device and for storing block maps and generation information transmitted from the information center device in the terminal storage unit; and a terminal storage unit capable of storing the block maps, which are divided on a block-by-block basis, together with their generation information, the information center device provided outside of the vehicle at a location remote from the vehicle and comprising: a center storage unit for storing block maps divided on a block-by-block basis, their generation information, and information on intergenerational road updating; and a center control unit for computing a guided route based on the departure place and the destination transmitted from the terminal device, the center control unit for determining whether or not a latest block map not in the terminal device, of block maps containing the guided route, is present in the center storage unit, based on the generation information transmitted from the terminal device and information stored in the center storage unit, wherein when the latest block map is determined to be present, the center control unit transmits the latest block map and its generation information to the terminal device and further determines whether or not a newly opened road connected to the computed guided route is contained in the latest block map, based on the generation information transmitted from the terminal device, including the information on intergenerational road updating, and information stored in the center storage unit, when the newly opened road is determined to be present, the center control unit transmits not only the latest block map containing the guided route but also a block map containing the newly opened road to the terminal device, the information on intergenerational road updating including information on updates of a respective block map from one or more previous generations, the generation information indicating a latest generation numbers of respective block maps.