1. A robot platform for driving a genetic robot which determines an expression behavior according to genetic information, the robot platform comprising: a recognition unit for recognizing a stimulation generated to the genetic robot; a memory unit for storing internal-state-related gene information including a parameter for at least one internal state of the genetic robot, and instinctive-behavior-related gene information including a parameter of at least one specific behavior defined as an instinctive behavior for at least one stimulation; a behavior determination unit for determining an expression behavior to be expressed by the genetic robot according to one of the internal-state-related gene information and instinctive-behavior-related gene information, and determining whether the expression behavior is to be expressed; a behavior implementation unit for implementing a behavior of the genetic robot; and a hardware controller for recognizing the stimulation through the recognition unit, controlling the behavior determination unit to determine the expression behavior by using one of the internal-state-related gene information and instinctive-behavior-related gene information according to whether the recognized stimulation corresponds to a stimulation included in the instinctive-behavior-related gene information, and controlling the behavior implementation unit so the genetic robot implements the expression behavior when the expression behavior has been determined, wherein, when the recognized stimulation corresponds to the stimulation included in the instinctive-behavior-related gene information, the expression behavior is determined based on at least one of a number of repeated times the recognized stimulation has occurred and a duration of the recognized stimulation.