In a communication apparatus, effective automatic power control (APC) is
realized, transmission object signal level changing units change a level
of a transmission object signal of each channel, and transmission filter
units carry out filtering for a signal of each channel after its level
was changed with a characteristic for allowing a passage of a frequency
component of each channel, and a transmission signal coupling unit
couples signals of plural channels after the filtering was carried out,
and an antenna transmits a coupled signal by wireless, and coupled signal
dividing units divide a part of the coupled signal into a plurality of
signals, and level detection filter units carry out filtering for each
divided signal with an identical characteristic to the above-described
characteristic and signal level detecting units detect a level of a
signal of each channel after the filtering was carried out, and a
transmission object signal level change mode controlling unit controls a
level change mode of a transmission object signal of each channel on the
basis of the detection result.