1. An information searching method of profile information, comprising: a candidate data searching step wherein on the basis of input data in which attribute values have been designated, a plurality of similar candidate data is searched from a profile data group having a peculiar attribute value every different attribute; a significance calculating step wherein significance regarding the attribute is calculated on the basis of said searched candidate data and non-candidate data; a score calculating step wherein a score of each of said candidate data is calculated on the basis of said calculated significance; and a search result outputting step wherein each candidate data is ranked on the basis of said calculated score and said ranked upper candidate data is outputted as a search result.