| 摘要 |
A radio terminal according to a present invention comprising a communication judgment unit (131) configured to judge whether or not the direct communication with the radio base station is possible to continue; a message processor (132) configured to transmit an inquiry message inquiring whether or not a direct communication with the radio base station is possible, to a lower-level radio terminal in the tree structure network, when the continuation judgment unit judges that the direct communication with the radio base station is not possible to continue; and a master manager configured to register the lower-level radio terminal as an upper-level radio terminal in the tree structure network, upon receipt of a response message indicating that a direct communication with the radio base station is possible, from the lower-level radio terminal.
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