To automatically set up temporarily the parameters required for radio
communication, based on the parameters acquired from another base station
apparatus existing in the neighborhood. A pair of base station identifier
and down scrambling code reported from a base station apparatus in the
neighborhood is acquired. The non-overlapping down scrambling code is set
to a newly established base station apparatus based on the acquired
contents. Whether or not the base station apparatus is located in the
neighborhood is judged according to at least one of the Hop number and
the required arrival time on a communication path up to the base station
apparatus.