The present invention relates to a billing system, method, a service server and end-point terminal respectively which allows the end-point terminal to use billing authentication information of another mobile communication terminal. The billing system comprises: a first mobile communication terminal and at least a second mobile communication terminal with each mobile communication terminal connected in common to a service server through a mobile communication network in which said end-point terminal is connected to said first mobile communication terminal through a first short-range communication network for providing contents to the first end-point terminal that uses the billing authentication information of the second mobile communication terminal and a billing server for performing a billing process if the service server transmits contents to the first end-point terminal upon validation by the service server by comparing the billing authentication information transmitted from the first end-point terminal with billing authentication information received from the second mobile communication terminal to determine if a match exists.