14. A non-transitory computer readable storage medium for recording a speaker selecting program for causing a computer which performs a speaker selection step for selecting speakers using speaker models stored in a speaker model storage means that stores a plurality of speaker models, to execute: a speaker score calculation step for calculating a first likelihood and a second likelihood based on the voice signals of two relatively different time lengths; a first selection step for selecting speakers corresponding to a predetermined number of speakers the first likelihood of which is high; a second selection step for narrowing the speakers selected in the first selection step down to speaker models the number of which is smaller than the predetermined number and the second likelihood of which is high; and a step for sequentially outputting information corresponding to the speakers selected in the second selection step.
16. The non-transitory computer readable storage medium for recording a speaker selecting program according to claim 14 , wherein the speaker score calculation step includes causing the computer to calculate, as the first likelihood, a short-time likelihood based on a voice signal of a relatively short time, and to calculate, as the second likelihood, a long-time likelihood based on a voice signal of a relatively long time, the first selection step includes causing the computer to execute a short-time selection step for selecting speakers corresponding to a predetermined number of speaker models the short-time likelihood of which is high, and the second selection step includes causing the computer to execute a long-time selection step for selecting speakers corresponding to speaker models the number of which is smaller than the predetermined number and the long-time likelihood of which is high.