In a mobile communication system in which a plurality of base stations included in a CoMP cooperating set allocate a communication resource to a user terminal to perform communication, each of the plurality of base stations comprises a receiver that receives information on resource allocation to the user terminal in another base station included in the CoMP cooperating set, from the other base station; and a reporting unit that reports information on another specific base station included in the CoMP cooperating set to a CoMP management apparatus managing the CoMP cooperating set when the receiver does not normally receive the notification from the other specific base station.