The internal information, i.e. the syllable formation rule, of the language plays an important role in the statistical relation between the syllable articulation and the phoneme articulation, especially when the articulation scores are low. This is taken account in deriving an expression for the relation between the syllable articulation and the phoneme articulation scores, which agrees well with the experimental results of standard colloquial Chinese and accounts for the differences between theory and experiment for English and Japanese by previous authors.