Abstract: A drive diagnosis device includes: a storage unit in which travel records of a moving body and past drive diagnosis results from past drive diagnoses executed for the moving body are stored; and a diagnosis processing unit that executes a drive diagnosis based upon driver's skills for driving the moving body, and personal characteristics of the driver and/or experience of the driver by using the travel records and the past drive diagnosis results stored in the storage unit.

Abstract: A drive diagnosis device includes: a storage unit in which travel records of a moving body and past drive diagnosis results from past drive diagnoses executed for the moving body are stored; and a diagnosis processing unit that executes a drive diagnosis based upon driver's skills for driving the moving body, and personal characteristics of the driver and/or experience of the driver by using the travel records and the past drive diagnosis results stored in the storage unit.

Abstract: A navigation system which guides a moving body to a destination, includes: a plurality of terminal devices, each installed in one of a plurality of moving bodies; and a center device engaged in communication with the plurality of terminal devices via a communication line, wherein: the center device includes a travel-completion information generation unit that generates travel-completion information pertaining to travel-completed records based upon information related to traveling conditions of one of the plurality of moving bodies, a storage unit in which sets of the travel-completion information corresponding to the plurality of moving bodies are stored, and a route search unit that searches for a recommended route to the destination based upon the sets of the travel-completion information; and the terminal device guides the moving body to the destination based upon the recommended route.

Abstract: A central apparatus that communicates with an information terminal mounted in a vehicle that travels by employing stored energy, includes: a reception unit that receives position information for the information terminal or for the vehicle, and a search condition inputted to the information terminal; a potential driving distance calculation unit that calculates an energy consumption amount for each of various road links based upon the position information and the search condition, and calculates a potential driving distance based upon the energy consumption amounts that have been calculated; and a transmission unit that transmits to the information terminal information relating to the potential driving distance that has been calculated for display upon the information terminal.