A communication system having a charging unit price information apparatus, said communication system being connected to a plurality of communication networks at a receiving side, said plurality of communication networks including an informing communication network for informing the charging unit price, a charging network, separate from the informing network, including a charging unit price information database, and a mobile communication network, separate from the charging network, having a location information database storing the location of the mobile terminal as a communication terminal at the receiving side, said charging unit price information apparatus comprises:
- means for directing, in response to an inquiry from the informing network to the charging unit price information database for the charging unit price, the charging unit price information database to refer to the location information database for the location;
- means for providing the charging unit price according to the location to the informing network, the informing network determining the charging unit price;
- and
- means for supplying the charging unit price information to at least one of a communication terminal at a calling side and the communication terminal at the receiving side.