Abstract: In order to solve a problem of making it possible to provide a technique by which assigning a pseudo label is possible regardless of the presence or absence of class-labeled data, an information processing apparatus 1 includes: an inferring means (11) for inferring a class regarding data pieces which constitute time-series data; a calculating means (12) for calculating a degree of agreement among results of inference made by the inferring means regarding a plurality of data pieces contained in a section which is temporally continuous; and a pseudo label assigning means (13) for assigning a pseudo label based on the results of inference in the section, to at least one of the plurality of data pieces in the section, according to the degree of agreement.