Wireless device and wireless network system

A wireless terminal using, as a communication channel for communication, either or any of two or more wireless channels to be used in a wireless network formed between the wireless terminal and at least one other wireless terminal, the wireless terminal comprising:

• a channel measuring unit having a function of measuring a state of use indicating whether or not a communication state of each of the two or more wireless channels is optimal and outputting a result of the measurement;
• a receiving unit for receiving the state of use of the wireless channel measured by the other wireless terminal with which the communication currently proceeds from the other wireless terminal;
• a communication channel determining unit for determining a new communication channel in an optimal communication state to be newly used for the communication in place of the currently used communication channel based on a result of summing up the states of use obtained as the measurement results outputted from the channel measuring unit of the wireless terminal to which it belongs and the measurement results outputted from the channel measuring unit of the other wireless terminal and outputting a channel change instruction for changing the currently used communication channel to the new communication channel;
• a channel changing unit for changing the currently used communication channel to the new communication channel in response to the channel change instruction outputted from the communication channel determining unit that has determined the new communication channel;
• and
• a transmitting unit for transmitting the channel change instruction outputted from the communication channel determining unit to the other wireless terminal.