Abstract: A method is disclosed for performing comprehensive management for vehicles owned by clients, and according to this method, a vehicle managing apparatus, a client terminal, a workshop terminal and a store terminal are connected via a communication network, and the vehicle managing apparatus includes information acceptance unit, maintenance period calculation unit, business efficiency analyzation unit and information providing unit. First, maintenance history information for vehicles, automotive accessories purchase history information, vehicle operating record information and business performance information for a client, entered by the workshop terminal or the store terminal are received. Sequentially, a maintenance period for a vehicle is calculated based on the above information, and business efficiency is obtained based on the above information. Then, maintenance period calculation results and the business efficiency analysis results are transmitted to the client terminal.