A mobile communication method for location registration in a mobile communication network having femtocells and macrocells, comprising the following steps: i) a step A of, in a communication start procedure performed by a mobile station through a femtocell, transmitting, by a radio network controller, an "INITIAL UE MESSAGE" including the frequency of the femtocell and the femtocell ID for uniquely identifying the femtocell to an exchange apparatus, acquiring, by the exchange apparatus, the frequency of the femtocell and the femtocell ID included in the "INITIAL UE MESSAGE"; ii) a step B of storing, by the exchange apparatus and a home location register, the acquired frequency of the femtocell and the acquired femtocell ID in association with subscriber information of the mobile station; iii) a step C of transmitting a location registration request signal to the exchange apparatus by the radio network controller, the location registration request signal having been transmitted from the mobile station visiting a macrocell through a radio connection established with the mobile station; iv) a step D of performing, by the exchange apparatus and the home location register, location registration to register the mobile station for a location registration area to which the femtocell geographically overlaid with the macrocell belongs, in response to the received location registration request signal; v) in a release procedure of the radio connection after completion of the location registration, a step E of notifying, by the exchange apparatus, the radio network controller of the frequency of the femtocell, and of notifying, by the radio network controller, the mobile station of the notified frequency of the femtocell; and vi) step F of starting, by the mobile station, a camping procedure on the notified frequency of the femtocell. i) a step A of, in a communication start procedure performed by a mobile station through a femtocell, transmitting, by a radio network controller, an "INITIAL UE MESSAGE" including the frequency of the femtocell and the femtocell ID for uniquely identifying the femtocell to an exchange apparatus, acquiring, by the exchange apparatus, the frequency of the femtocell and the femtocell ID included in the "INITIAL UE MESSAGE"; ii) a step B of storing, by the exchange apparatus and a home location register, the acquired frequency of the femtocell and the acquired femtocell ID in association with subscriber information of the mobile station; iii) a step C of transmitting a location registration request signal to the exchange apparatus by the radio network controller, the location registration request signal having been transmitted from the mobile station visiting a macrocell through a radio connection established with the mobile station; iv) a step D of performing, by the exchange apparatus and the home location register, location registration to register the mobile station for a location registration area to which the femtocell geographically overlaid with the macrocell belongs, in response to the received location registration request signal; v) in a release procedure of the radio connection after completion of the location registration, a step E of notifying, by the exchange apparatus, the radio network controller of the frequency of the femtocell, and of notifying, by the radio network controller, the mobile station of the notified frequency of the femtocell; and vi) step F of starting, by the mobile station, a camping procedure on the notified frequency of the femtocell.