A gateway change method of changing a serving gateway (60, 70, 70A, 70B) for a connection to a terminal in a communication system including the terminal, a plurality of base stations (20, 20A, 20B, 20C, 20D, 20E, 20F), a plurality of serving gateways (60, 70, 70A, 70B), and a communication control device controlling the gateway change method, the method comprising: an acquisition step in which information associating serving gateways (60, 70) to the plurality of base stations is acquired, wherein a first serving gateway associated to a base station is a serving gateway that transmits or receives a control signal using a control plane, which is a path for transmitting the control signal for a communication service used by the terminal, and a second serving gateway associated to a base station is a serving gateway that transmits or receives a user data signal using a user plane, which is a path for transmitting the user data signal for the communication service; a request reception step of receiving a handover request and identifying a target base station and a source base station in the handover request; and a gateway change step of using information from the acquisition step to identify a first serving gateway and a second serving gateway associated with the target base station identified by the request reception step and a first serving gateway and a second serving gateway associated with the source base station identified by the request reception step, determining whether or not the first serving gateway is to be changed by comparing the first serving gateway associated with the target base station with the first serving gateway associated with the source base station and determining whether or not the second serving gateway is to be changed by comparing the second serving gateway associated with the target base station with the second serving gateway associated with the source base station, and making change requests for any serving gateway (60, 70) that has been determined to be changed, and wherein, in the gateway change step, in a case where the first serving gateway is not to be changed but the second serving gateway is to be changed, a change request only for the second serving gateway is made. an acquisition step in which information associating serving gateways (60, 70) to the plurality of base stations is acquired, wherein a first serving gateway associated to a base station is a serving gateway that transmits or receives a control signal using a control plane, which is a path for transmitting the control signal for a communication service used by the terminal, and a second serving gateway associated to a base station is a serving gateway that transmits or receives a user data signal using a user plane, which is a path for transmitting the user data signal for the communication service; a request reception step of receiving a handover request and identifying a target base station and a source base station in the handover request; and a gateway change step of using information from the acquisition step to identify a first serving gateway and a second serving gateway associated with the target base station identified by the request reception step and a first serving gateway and a second serving gateway associated with the source base station identified by the request reception step, determining whether or not the first serving gateway is to be changed by comparing the first serving gateway associated with the target base station with the first serving gateway associated with the source base station and determining whether or not the second serving gateway is to be changed by comparing the second serving gateway associated with the target base station with the second serving gateway associated with the source base station, and making change requests for any serving gateway (60, 70) that has been determined to be changed, and wherein, in the gateway change step, in a case where the first serving gateway is not to be changed but the second serving gateway is to be changed, a change request only for the second serving gateway is made.