To provide a wireless communication system adopting the adhoc communication method capable of securing the information reachability in broadcast communication between terminals.

For example, a wireless communication terminal 101 first taking part in a cluster acts like a cluster master and periodically distributes, through broadcast communication, cluster information consisting of the terminal identifiers of wireless communication terminals already taking part in the cluster including its own terminal. For example, in the case that a wireless communication terminal 102 newly takes part in the cluster, the wireless communication terminal 102 receives the cluster information, makes unicast communication with each of all the wireless communication terminals already taking part in the cluster included in the cluster information and takes its part in the cluster when the communication reachability with all the communication terminals is secured so as to attain the unicast communication and the broadcast communication with the wireless communication terminals taking part in the cluster.