To provide a reference data editing device and a reference data editing method, capable of detecting an interval to be sung by using vobratos technology from a reference data and adding a data for indicating the detected interval to the reference data, and to provide an evaluation device and a vibratos evaluation method, capable of evaluating the vibratos technique of singer's voice, based on the vibratos period in the reference data detected.

A CPU 11 of a karaoke device 1 detects a pitch from a guide melody, and first specifies a "reference vobratos period" from the variation aspect of the pitch. Namely, the vibratos is detected by an index that the pitch rises for a short interval, and returns to the original pitch. Moreover, the detected reference vibratos interval is compared with a period, when the vobratos is used in the singing voice which is detected separately, and the vibratos technique is evaluated, based on whether the singer would sing with vibratos, with suitable timing.