A multicast control device capable of reducing the distribution time of multicast data is provided. A multicast control device (10) according to the present disclosure includes a determination unit (11) configured to determine whether the number of communication terminals joining a multicast service exceeds a predetermined threshold, and a session control unit (12) configured to start a multicast session for a plurality of communication terminals joining the multicast service when it is determined that the number of communication terminals joining the multicast service exceeds the predetermined threshold.