A method for managing a resource in a shared network includes: receiving an adjustment request from a PCEF entity, the adjustment request indicates a participant mobile network operator to which user equipment belongs, and requests to adjust a guaranteed bit rate quota and/or a maximum bit rate quota of the participant mobile network operator in the PCEF entity; obtaining, 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; and sending an adjustment response to the PCEF entity according to the subscription guaranteed bit rate resource and the used guaranteed bit rate resource, the adjustment response indicates whether the PCEF entity is allowed to adjust the guaranteed bit rate quota and/or the maximum bit rate quota.