To greatly reduce the load accompanying voice database generation on an operator.

This device has a KANA (Japanese syllabary) character expansion part 1, which expands a reading which is described in KANA into phoneme series candidates which can be possibly obtained when the reading is pronounced, a phoneme series selection part 2 which selects the phoneme series bet matching the actual voice data most among the phoneme series candidates expanded by the expansion part 1, a phoneme segmentation part 3 which computes the boarder positions of respective phonemes of voice data in accordance with the phoneme series selected by the selection part 2, and a phoneme border position editor part 4 for interactively correcting the results obtained by the selection part 2 and segmentation part 3.