The system according to the invention comprises a text-to-speech conversion processing unit, and a phrase dictionary as well as a waveform dictionary, connected independently from each other to the conversion processing unit. The conversion processing unit is for converting any Japanese text inputted from outside into speech. In the phrase dictionary, voice-related terms representing the reproduced sounds of actually recorded sounds, for example, notations of terms such as onomatopoeic words, background sounds, lyrics, music titles, and so forth, are previously registered. Further, in the waveform dictionary, waveform data obtained from the actually recorded sounds, corresponding to the voice-related terms, are previously registered. Furthermore, the conversion processing unit is constituted such that as for a term in the text matching the voice-related term registered in the phrase dictionary upon correlation of the former with the latter, actually recorded speech waveform data corresponding to the relevant voice-related term matching the term in the text, registered in the waveform dictionary, is outputted as a speech waveform of the term.