A radio network sharing method, characterized by comprising: obtaining a temporary mobile subscriber identity of a mobile terminal; extracting a network resource identifier from the temporary mobile subscriber identity of the mobile terminal; according to the network resource identifier and a preset mapping relationship between the network resource identifier and an operator, determining an operator corresponding to the mobile terminal; and routing service signaling of the mobile terminal to a core network of the operator corresponding to the mobile terminal; wherein the mapping relationship between the network resource identifier and the operator is a mapping relationship between a network resource identifier of a roaming mobile terminal and an visited operator, characterized in that the according to the network resource identifier and a preset mapping relationship between the network resource identifier and an operator, determining an operator corresponding to the mobile terminal comprises: according to the network resource identifier, determining a category of roaming subscriber, wherein the category indicates a proportion relationship between shared core networks of different operators to which this category of subscriber is routed; and according to a mapping relationship between the network resource identifier of this category of subscriber and an operator, determining an operator corresponding to the roaming subscriber. obtaining a temporary mobile subscriber identity of a mobile terminal; extracting a network resource identifier from the temporary mobile subscriber identity of the mobile terminal; according to the network resource identifier and a preset mapping relationship between the network resource identifier and an operator, determining an operator corresponding to the mobile terminal; and routing service signaling of the mobile terminal to a core network of the operator corresponding to the mobile terminal; wherein the mapping relationship between the network resource identifier and the operator is a mapping relationship between a network resource identifier of a roaming mobile terminal and an visited operator, characterized in that the according to the network resource identifier and a preset mapping relationship between the network resource identifier and an operator, determining an operator corresponding to the mobile terminal comprises: according to the network resource identifier, determining a category of roaming subscriber, wherein the category indicates a proportion relationship between shared core networks of different operators to which this category of subscriber is routed; and according to a mapping relationship between the network resource identifier of this category of subscriber and an operator, determining an operator corresponding to the roaming subscriber. according to the network resource identifier, determining a category of roaming subscriber, wherein the category indicates a proportion relationship between shared core networks of different operators to which this category of subscriber is routed; and according to a mapping relationship between the network resource identifier of this category of subscriber and an operator, determining an operator corresponding to the roaming subscriber.