Location register location registration system andlocation registration method

A location registration system 10 comprises a mobile communication terminal 12 and a location register 14 for carrying out location registration of the mobile communication terminal 12. The location register 14 comprises a storage section 16 for storing the number of stays of the mobile communication terminal 12; a location registration period determination section 18 for determining a period of location registration of the mobile communication terminal 12 according to the number of stays of the mobile communication terminal 12 stored in the storage section 16; and a location registration control section 20 for transmitting the period of location registration determined by the location registration period determination section 18 to the mobile communication terminal 12, receiving location information of the mobile communication terminal 12 transmitted therefrom in response to the transmitted period of location registration, and carrying out location registration of the mobile communication terminal 12 according to the received location information.