A service switching method, comprising: receiving a control message for switching between a unicast service and a multicast service; and reusing (204; 205) access line resources of the multicast service when the multicast service is switched to the unicast service, or reusing (305; 310) access line resources of the unicast service when the unicast service is switched to the multicast service according to the control message; wherein the receiving of the control message for switching between the unicast service and the multicast service comprises: receiving, by a resource manager, a message carrying a resource reuse indication sent by a service controller, wherein the message carrying the resource reuse indication serves as the control message, to instruct the resource manager to reuse the access line resources of the multicast service when the multicast service is switched to the unicast service; and wherein the reusing of the access line resources of the multicast service when the multicast service is switched to the unicast service according to the control message comprises: sending, by the resource manager, a resource reuse operation indication to a network edge node according to the resource reuse indication, to indicate that the currently used multicast resources needs to be classified into unicast resources; and classifying (204;207), by the resource manager, the multicast resources released by the network edge node into the unicast resources, to implement reuse of the access line resources of the multicast service when the multicast service is switched to the unicast service. receiving a control message for switching between a unicast service and a multicast service; and reusing (204; 205) access line resources of the multicast service when the multicast service is switched to the unicast service, or reusing (305; 310) access line resources of the unicast service when the unicast service is switched to the multicast service according to the control message; wherein the receiving of the control message for switching between the unicast service and the multicast service comprises: receiving, by a resource manager, a message carrying a resource reuse indication sent by a service controller, wherein the message carrying the resource reuse indication serves as the control message, to instruct the resource manager to reuse the access line resources of the multicast service when the multicast service is switched to the unicast service; and wherein the reusing of the access line resources of the multicast service when the multicast service is switched to the unicast service according to the control message comprises: sending, by the resource manager, a resource reuse operation indication to a network edge node according to the resource reuse indication, to indicate that the currently used multicast resources needs to be classified into unicast resources; and classifying (204;207), by the resource manager, the multicast resources released by the network edge node into the unicast resources, to implement reuse of the access line resources of the multicast service when the multicast service is switched to the unicast service. sending, by the resource manager, a resource reuse operation indication to a network edge node according to the resource reuse indication, to indicate that the currently used multicast resources needs to be classified into unicast resources; and classifying (204;207), by the resource manager, the multicast resources released by the network edge node into the unicast resources, to implement reuse of the access line resources of the multicast service when the multicast service is switched to the unicast service.