The following non-patent literature 1, which is the standards of IPv6 over Low-power Wireless Personal Area Networks (6LoWPAN), is conventionally known. 6LoWPAN allows IPv6 to be available on IEEE 802.15.4. In 6LoWPAN, wireless devices performing communication over IPv6 in a low-power consumption wireless link do not include enough internal resources, and in some cases, it takes 20 to 30 msec to transmit a ping packet in the same link, for example. High resource devices such as PCs can transmit a ping packet in the order of milliseconds or less.