A mobile communication terminal includes a location registration request unit 120 that makes a location registration request for a location registration in each of the mobile communication networks 200 and 300 to a 3.9G network 300, a location registration response receiving unit 130 that receives a location registration response representing a result of the location registration in the both mobile communication networks 200 and 300 in response to the request for the location registration, a location registration determination unit 140 that determines whether or not the location registration only in the 3.9G network 300 between the both mobile communication networks 200 and 300 is completed, based on the location registration response, and a first mobile communication network switching control unit 150 that performs a switching control of the mobile communication network for causing the mobile communication terminal 100 to be resident in the 2G/3G network 200 in a case where the location registration determination unit 140 determines that the location registration only in the 3.9G network 300 is completed.