Abstract: A method of managing information regarding vehicles and customers is provided in which information regarding vehicle and customers are stored in a consolidated manner after the vehicle has been sold. The method is basically accomplished by creating a management database that is based on customer information received from a sales company and vehicle information received from a vehicle manufacturer. The management database integrates the aforementioned two types of information at a management center. Service information received from a service entity is sent to the sales company such that the service information can be presented to the customer. The customer information containing details regarding services contracted by the customer is sent to the service entity. Two-way communications are conducted between the management center and each customer to manage additions/changes to the customer information and contracted services.