A communication method, an access network device and a communication device using the same method, and a communication system are proposed. According to an embodiment, the communication method can include following step. An access network device determines whether there is any femto cell within the coverage area thereof. when there is at least one femto cell within the coverage area thereof, the access network device obtains femto cell information of the at least one femto cell; and delivers the femto cell information to at least one terminal device within the coverage area thereof, where the femto cell information includes an indication of the at least one femto cell, at least one femto cell identifier and at least one carrier frequency of the at least one femto cell.