A wireless packet communication system that enables a wireless terminal to
move from one wireless LAN to another while maintaining packet
communication. The wireless terminal detects the electric field strength
of a carrier signal from each base station during at least one back-off
period, creates move destination information based on a carrier signal
having the greatest electric field strength and the IP address of the
currently used base station, and transmits the created Information and IP
address to a server. The server writes the IP address of the wireless
terminal into an edge router connected to a base station at the move
destination in accordance with the information and IP address created by
the wireless terminal to ensure that the packet data from a remote party
is transmitted from the base station at the move destination.