1. A method of identifying a boundary condition between components of an object of analysis, the method comprising the steps of: calculating natural frequencies or resonance frequencies of finite-element method models and calculated mode vectors by using the finite-element method models for analysis which include an object of analysis including a plurality of components and a plurality of elements which are positioned between the components of the object of analysis and indicate a boundary condition between the components; extracting a calculated mode vector having a high degree of correlation for an experimental mode vector obtained in an experiment; and identifying the boundary condition of the elements based on the extracted calculated mode vector and the natural frequency or the resonance frequency corresponding to the extracted calculated mode vector.