A mobile communication method according to the present invention includes the steps of: when an S-CSCF in an IMS receives a terminating signal directed to a UE, sending the terminating signal from the S-CSCF to an SCC-AS in the IMS, the terminating signal including call-type information indicating whether the terminating signal is for voice communication or AV communication; sending an inquiry signal including the call-type information from the SCC-AS to an HSS; and determining, by the SCC-AS, a domain to which the terminating signal is to be transferred, based on the call-type information and a response signal received from the HSS as a response to the inquiry signal.