of a mobility management ne includes an acquisition unit 901 a determination unit 902 and a bearer deletion control unit 903 the acquisition unit 901 is configured to acquire version information of a peer end management ne the determination unit 902 is configured to determine whether the version information of the peer end management ne acquired by the acquisition unit 901 indicates that the peer end management ne does not support interaction with an s gw and does not support an isr mechanism the bearer deletion control unit 903 is configured to execute a bearer deletion process if a determination result of the determination unit 902 is that the peer end management ne does not support interaction with the s gw and does not support the isr mechanism in this embodiment the peer end management ne refers to a target side management ne in this embodiment the bearer deletion control unit 903 may be implemented in two manners in a first manner the bearer deletion control unit 903 includes an address acquisition unit 9031 and a deletion instruction unit 9032 the address acquisition unit 9031 is configured to acquire address information of an original side heterogeneous system management ne the deletion instruction unit 9032 is configured.