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 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 currently-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.