Patent ID: 8543583

Claim:
An information processing apparatus, comprising: a processor serving as: a document analyzing unit that extracts phrases including a pair of entities, to which a relevance label is granted, from document data, and a label granting unit that grants the relevance label indicating a kind of relevance between the pair of entities, wherein the label granting unit: acquires vocabulary syntax patterns included in the phrases including the pair of entities and acquires the appearing number of times the vocabulary syntax pattern appears in the document data from the document data by analyzing registration information regarding an existing relevance database having registration information regarding the pair of entities and the relevance label and the document data in which at least one phrase including the pair of entities registered in a relevance database is present, for a pair of the vocabulary syntax patterns, counts the number of pairs of entities appearing concurrently with both of each pair of the vocabulary syntax patterns in the document data, and sets a probability model created from a probability density distribution, which includes the counted number of pairs of entities, a parameter “Z” indicating validity of the granting of the relevance label, and a parameter “a” indicating a probability of rightly granting the relevance label, calculates the parameters Z and a for which a likelihood is maximum in the probability model, evaluates the validity of the granting of the relevance label for the pair of entities extracted from the document data, and grants the relevance label based on the evaluation result.