due to the fact that when a pan is broadcasting content data in the private mode the mobile communication terminal 14 or the headset 18 that has accessed the pan cannot receive the broadcasted content data unless it undergoes a specific authentication procedure the mobile communication terminal 14 can simply process the authentication procedure however the headset 18 has difficulty in processing the authentication procedure with the pan since it has a simple structure compared with the mobile communication terminal 14 therefore in the case where the pan is in the private mode the headset 18 accesses the pan via the mobile communication terminal 14 and processes the authentication procedure when the connection between the mobile communication terminal 14 and the pan is closed even the connection between the pan and the headset 18 which was connected thereto through the mobile communication terminal 14 in the private mode is also automatically disconnected in the private mode the headset 18 should be reconnected to the mobile communication terminal 14 to process the authentication procedure even through there is no need for the authentication procedure as the pan is in the public mode the headset 18 should resume the connection with the mobile communication terminal 14 the headset 18 can perform a call function in addition to the content data reproduction function and the headset 18 cannot perform the call function unless it is connected to the mobile communication terminal 14 therefore in the zigbee network system according to an embodiment of the present invention even when the headset 18 directly accesses the pan.