An apparatus supports acquisition of information from a document including a plurality of words. An acquisition hardware unit acquires first information that shows a degree to which the document belongs to each of a plurality of clusters based on a concept included in the document. Second information shows a degree to which a single word among the plurality of words appears in each of the plurality of clusters based on a concept of the single word. A generation hardware unit, based on the first and second information, generates third information that shows a degree of overlap between the concept included in the document and the concept of the single word. A determination hardware unit determines whether or not the third information shows a degree of overlap that is lower than a predetermined criterion, and an output hardware unit outputs a result of this determination.