A mobile communication terminal, base station and registration control method are capable of preemptively preventing congestion between a mobile communication terminal and a wireless base station distributing multicast content. The mobile communication terminal judges whether or not a restriction is applied (Step S12) or a partial restriction (partially restricted) is applied (Step S14) in a currently assigned frequency channel. When a restriction or partial restriction is applied, registration is not carried out. Meanwhile, when only a partial restriction is applied or when neither a restriction nor partial restriction is applied, a judgment is made as to whether or not the registration is authorized (Step S16). If authorization is given, registration is executed (Step S20) after a predetermined standby time (Step S18).