A system for generating topic inference information of lyrics that can provide more useful for topic interpretation of lyrics. A device for learning topic numbers performs an operation of updating and learning topic numbers, which performs an operation of updating topic numbers on all of a plurality of lyrics data of each of a plurality of artists, for a predetermined number of times. The operation of updating topic numbers updates the topic number assigned to a given lyrics data of a given artist using a random number generator having a deviation of appearance probability corresponding to a probability distribution over topic numbers. An outputting device outputs the topic numbers of the plurality of lyrics data for each of the plurality artists, and a probability distribution over words for each of the topic numbers.