Disclosed is a communication method. The method comprises: S101. when a mobile terminal enters a service area of a signal base station, the mobile terminal constructing a communication connection with the signal base station, and a relay station forming a restricted area for the mobile terminal; S102. after receiving a downlink data signal from the signal base station, the relay station converting the downlink data signal into a restricted downlink data signal; and S103. after receiving the restricted downlink data signal from the relay station, the mobile terminal sending a restricted uplink data signal to the signal base station in a manner synchronized with receiving the downlink data signal from the signal base station. Further disclosed is a communication system. The present invention can provide a fast and simple communication method.