1. An information processing apparatus, comprising: analyzing means for chronologically continuously analyzing sound data which chronologically continue in each of predetermined frequency bands; continuous characteristic quantity extracting means for extracting a continuous characteristic quantity which is a characteristic quantity which chronologically continues from an analysis result of the analyzing means; cutting means for cutting the continuous characteristic quantity into regions each of which has a predetermined length; regional characteristic quantity extracting means for extracting a regional characteristic quantity which is a characteristic quantity represented by one scalar or vector from each of the regions into which the continuous characteristic quantity has been cut; and target characteristic quantity estimating means for estimating a target characteristic quantity which is a characteristic quantity which represents one characteristic of the sound data from each of the regional characteristic quantities, wherein the target characteristic quantity estimating means is pre-created by learning teacher data composed of sound data which chronologically continue and a characteristic quantity which represents one correct characteristic of sound data in each of the regions into which the continuous characteristic quantity has been cut.