2. The system according to claim 1 , wherein the computing section is operable to compute, as the score, a degree of difference in pronunciation between first and second phoneme segment data pieces contained in the voice data and connected to each other, at a boundary between the first and second phoneme segment data pieces.
2. The system according to claim 1 , wherein the computing section is operable to compute, as the score, a degree of difference in pronunciation between first and second phoneme segment data pieces contained in the voice data and connected to each other, at a boundary between the first and second phoneme segment data pieces. 3. The system according to claim 2 , wherein: the phoneme segment storage section is operable to store a data piece representing fundamental frequency and tone of the sound of each phoneme as the phoneme segment data piece, and the computing section is operable to compute, as the score, a degree of difference in the fundamental frequency and tone between the first and second phoneme segment data pieces at the boundary between the first and second phoneme segment data pieces.