The present invention provides elastic constant and visco elastic constant measurement apparatus etc. The balloon catheter is positioned in the stomach of the patient, and then expanded with a heat exchange fluid delivered through a lumen formed in the shaft of the catheter. The method also includes transmitting information associated with the web service, the comment, and the influence rating to a user. The platform is constructed of transparent material such as clear acrylic plastic. , a platform development stage, a module development stage, and a user-oriented robot developmentuser service development stage.