communication terminal a when two communication terminals are ready to communicate with each other one communication terminal named u201c communication terminal a u201d first originates establishment of a network i e a coordinator in a wireless personal area network wpan the communication terminal a acts as an originator to establish a personal area network with a frame structure with a beacon another communication terminal named u201c communication terminal b u201d searches the network and finds the pan established by the communication terminal a and then joins in the pan after establishment of the pan the communication terminal a indicates in a broadcasted beacon that the data is needed for transmission to the communication terminal b the communication terminal b finds that there is data for reception upon listening of the network beacon then sends a data request command to the communication terminal a during a contention access period i e parts of a data frame other than the beacon the communication terminal a sends to the communication terminal b the data for transmission during the contention access period upon reception of the request command in particular a channel resource for data transmission is obtained in the approach of carrier sense multiple access with collision avoidance csma ca during a contention access period the communication terminal of the present invention may comprise such a terminal device as a.