A method for managing a resource in a shared network, comprising: receiving at a Policy and Charging Rule Function, PCRF, entity an adjustment request sent by a policy and charging enforcement function, PCEF, entity, wherein the adjustment request indicates a participant mobile network operator to which user equipment belongs, and requests to adjust a guaranteed bit rate quota and a maximum bit rate quota of the participant mobile network operator in the PCEF entity, the maximum bit rate quota is a sum of maximum bit rate resources that are in the PCEF entity and that can be used by all guaranteed bit rate resource bearers of the participant mobile network operator, and the guaranteed bit rate quota is a sum of guaranteed bit rate resources that are in the PCEF entity and that can be used by all the guaranteed bit rate resource bearers of the participant mobile network operator; obtaining at a Policy and Charging Rule Function, PCRF, entity according to the adjustment request, a subscription guaranteed bit rate resource allocated by a primary operator to the participant mobile network operator and a used guaranteed bit rate resource of the participant mobile network operator, wherein the used guaranteed bit rate resource is a sum of guaranteed bit rate resources currently used by all guaranteed bit rate bearers of the participant mobile network operator, and the subscription guaranteed bit rate is a sum of guaranteed bit rate resources that can be used by all the guaranteed bit rate bearers of the participant mobile network operator at any moment; and sending by the Policy and Charging Rule Function, PCRF, entity an adjustment response to the PCEF entity according to the subscription guaranteed bit rate resource and the used guaranteed bit rate resource, wherein the adjustment response indicates whether the PCEF entity is allowed to adjust the guaranteed bit rate quota and the maximum bit rate quota. receiving at a Policy and Charging Rule Function, PCRF, entity an adjustment request sent by a policy and charging enforcement function, PCEF, entity, wherein the adjustment request indicates a participant mobile network operator to which user equipment belongs, and requests to adjust a guaranteed bit rate quota and a maximum bit rate quota of the participant mobile network operator in the PCEF entity, the maximum bit rate quota is a sum of maximum bit rate resources that are in the PCEF entity and that can be used by all guaranteed bit rate resource bearers of the participant mobile network operator, and the guaranteed bit rate quota is a sum of guaranteed bit rate resources that are in the PCEF entity and that can be used by all the guaranteed bit rate resource bearers of the participant mobile network operator; obtaining at a Policy and Charging Rule Function, PCRF, entity according to the adjustment request, a subscription guaranteed bit rate resource allocated by a primary operator to the participant mobile network operator and a used guaranteed bit rate resource of the participant mobile network operator, wherein the used guaranteed bit rate resource is a sum of guaranteed bit rate resources currently used by all guaranteed bit rate bearers of the participant mobile network operator, and the subscription guaranteed bit rate is a sum of guaranteed bit rate resources that can be used by all the guaranteed bit rate bearers of the participant mobile network operator at any moment; and sending by the Policy and Charging Rule Function, PCRF, entity an adjustment response to the PCEF entity according to the subscription guaranteed bit rate resource and the used guaranteed bit rate resource, wherein the adjustment response indicates whether the PCEF entity is allowed to adjust the guaranteed bit rate quota and the maximum bit rate quota.