PURPOSE: A sensitivity index maturity type robot toy and a method for ripening a sensitivity of a robot toy are provided to enable a user to feel the sense for the real and a vividness, and to enjoy a growth of a robot toy by increasing a sensitivity index of the robot toy in an actual space, increasing a virtual robot sensitivity index corresponded to the robot toy in a virtual space connected to the Internet, and synchronizing sensitivity indexes of the robot toy in an actual space and the virtual robot in the virtual space. CONSTITUTION: If a synchronization of sensitivity indexes of a robot toy and a virtual robot in an operating server corresponded to the robot toy is requested in the operating server through a client server(S401,S402), the client server reads a sensitivity index being stored in a sensitivity index database of the robot toy(S403). The operating server receives a sensitivity index of the robot toy being stored in the client, reads a sensitivity index of the virtual robot from a DB system, and adds the sensitivity index to the sensitivity index of the robot toy(S404). The added value is transmitted to the client server and updated as new sensitivity index of the robot toy. That is, the sensitivity index of the robot toy becomes identified with the sensitivity index of the virtual robot(S405).
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