A terminal 100 detects a moving speed of the terminal 100 and
discriminates if it is necessary to switch a radio link between a radio
link 102 without soft handover and a radio link 103 with soft handover,
when it is necessary to switch the radio link, a request to switch states
with/without soft handover 106 is sent to a base station 101, the base
station 101 switches the states with/without soft handover based on the
request to switch states with/without soft handover 106, in addition, an
instruction to switch states with/without soft handover 107 is sent to
the terminal 100, and the terminal 100 switches the states with/without
soft handover based on the instruction to switch states with/without soft
handover 107.