A method and apparatus for determining the possibility of pattern
recognition of time series signal independent of a pattern recognition
ratio is provided. The method for determining the possibility of pattern
recognition of time series signal includes extracting a time forward
feature and a time reversed feature from an input signal having a time
series pattern, generating time forward alignment and time reversed
alignment by using the time forward feature and the time reversed
feature, comparing the time forward alignment with the time reversed
alignment to compute a likelihood of pattern recognition, and determining
that the input signal can be recognized if the likelihood is larger than
a predetermined threshold value. The possibility of the pattern
recognition of the whole system can be determined, independent of the
pattern recognition capability of each of the pattern recognition models,
by extracting the patterns from the time series signal by using the
plurality of the pattern recognition models and then obtaining the
likelihood between the patterns to compare the likelihood with the
threshold value. In addition, the pattern recognition can be performed in
the non-limited environment.