A radio terminal equipment includes a route supervision processing section for registering, for each destination address, an address of a radio-relay terminal equipment, which relays datagrams destined for the destination address, into a routing table in accordance with a predetermined dynamic routing protocol, a first transmission processing section for transmitting a datagram to a radio-relay terminal equipment corresponding to the destination address of the datagram in accordance with the routing table, a datagram supervision processing section for receiving the datagram transmitted by the radio-relay terminal equipment corresponding to the destination address of the datagram transmitted by the first transmission section to supervise whether or not the datagram has been relayed, and a second transmission processing section for transmitting, where the received datagram is to be relayed by the terminal equipment itself, the datagram to the radio terminal equipment corresponding to the destination address of the datagram in accordance with the routing table.