A subscriber data control method in a mobile communication network which reduces the processing load on a mobile switching center and can effectively use the resource of a visitor subscriber data area is provided. After receiving at a destination mobile switching center a request for location registration from a mobile station, a subscriber data request signal is transmitted to a home mobile switching center. Using an indication in the subscriber data request signal, the home mobile switching center judges if it is necessary to transmit subscriber data to the destination mobile switching center since the subscriber data is kept at destination mobile switching center for a predetermined period of time.