An analysis model control unit disposes at least two component models, which are to be used in assembly of a product to be evaluated, in virtual space displayed on a screen. A virtual glove controller moves and operates component models, which are disposed in virtual space, in accordance with an input operation signal of a user by a virtual glove. When the two component models are brought into contact with each other, a model conversion unit converts them into component analysis models. A deformed structure analysis unit executes structure analysis calculations with respect to the relative movement caused along with assembly of the two component analysis models after contact so as to calculate deformation and deformation stresses. An evaluation processing unit compares the deformation stress with a threshold stress of the material so as to evaluate whether assembly can be performed without breaking the components.