a hub hub control method , wherein the hub possesses an uplink port and a plurality of downlink ports , includes : receiving link status of each downlink port to know whether each downlink port has built a link ; and when none of the plurality of downlink ports has built a link , controlling the uplink port to be unable to build a link . a hub control circuit , the hub possessing an uplink port and a plurality of downlink ports , includes a link status reception unit and an uplink port control unit for respective execution of the two steps of the hub control method .