9. The segment information generation device according to claim 8 , further comprising: an attribute information storage unit comprising a storage device that stores, as attribute information, linguistic information indicating character strings corresponding to the natural speech, and prosody information of the natural speech.
9. The segment information generation device according to claim 8 , further comprising: an attribute information storage unit comprising a storage device that stores, as attribute information, linguistic information indicating character strings corresponding to the natural speech, and prosody information of the natural speech. 11. The segment information generation device according to claim 9 , wherein the prosody information comprises at least one of pitch frequency, amplitude, short-time power time series, and duration of respective syllables, phonemes and pauses contained in the natural speech.