1. A filter bank approach to adaptive filtering method using independent component analysis, comprising the steps of: separating each input signal into a plurality of frequency bands after passing the input signal through an analysis filter bank; constructing signals whose number is equal to the total number of analysis filters by selecting one sample from an arbitrarily determined number of samples for a filter output corresponding to each frequency band; applying the adaptive filtering method using independent component analysis to said above signals as a whole; inserting a number of samples which is one less than said determined number of samples and having zero values between two consecutive samples; and restoring result signals after passing through a synthesis filter bank.