A stereotypical sentence is synthesized into a voice of an arbitrary
speech style. A third party is able to prepare prosody data and a user of
a terminal device having a voice synthesizing part can acquire the
prosody data. The voice synthesizing method determines a voice-contents
identifier to point to a type of voice contents of a stereotypical
sentence, prepares a speech style dictionary including speech style and
prosody data which correspond to the voice-contents identifier, selects
prosody data of the synthesized voice to be generated from the speech
style dictionary, and adds the selected prosody data to a voice
synthesizer 13 as voice-synthesizer driving data to thereby perform voice
synthesis with a specific speech style. Thus, a voice of a stereotypical
sentence can be synthesized with an arbitrary speech style.