A source file analyzing method for specifying a class and its member influenced by a change made in a predetermined class included in a source file described in an object-oriented language. An inputter inputs a source file to be analyzed and provides it to a reference relationship examiner. The reference relationship examiner examines the reference relationships of classes and methods included in the classes, including class definitions, class member definition information regarding class member definitions, and class member content information regarding the contents of class members, creates reference relationship information indicating inheritance relationships among classes and class call relationships, and provides them to an influenced class specifier. The influenced class specifier accepts the name of a changed class entered and specifies an influenced class by referring to the class definition information, class member definition information, class member content information, and reference relationship information.