To provide a speech synthesizing method capable of reducing the connection distortion of a phoneme based upon the position of a pitch mark.

In the speech synthesizing method of selecting the combination of phoneme units which has the smallest sum of distortion from a target and connection distortion of the phoneme units among combinations of phoneme units and generating a synthesized speech waveform on a wavelength superposition basis according to the selected combination of phoneme units, phase information on the pitch waveform at the start end of each phoneme unit and phase information on the pitch waveform at the tail end of the phoneme unit are added to auxiliary information on the phoneme unit and the distance between the phase of the pitch waveform at the tail end of the precedent phoneme unit between two phoneme units to be connected together and the phase of the pitch information at the start end of the trailing phoneme unit is added as a parameter used to calculate the connection distortion of the phoneme units.

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