The purpose of this study tried to tell the brain sciences which is Choice Theory, the word stimuli affects whether the internal controls for the EEG and ERP in the P300 Amplitude value for and potential approaches, to such as low self-control due to the negative sentiment that is involved in an ongoing relationship with Internet Addiction Student. After K-scale youth self-diagnosis(40) to questions, the Internet Addiction Test questions were conducted in K middle school in Busan. This study was targeted at voluntary Internet Addiction followed by 12 people more than at high risk group and Non-Internet Addiction 12 people. EEG was measured by presenting theory that is, the word stimuli and stimuli presented External control word, Experimental methodology was applied to the introduction of the IAT(Implicit Association Test). EEG activity, the Left-Right cerebral hemisphere, Events-Related Potential(ERP) Amplitude value and Potential of the P300 groups were compared with measurements. With this study, the Choice Theory words stimulation of Reality Therapy was a positive and well- Union. alpha waves in the frontal lobe was activated and increases the Amplitude values, the value of P300 Amplitude is determined that treatment was rapid. From these findings, for a less Internal Control word to Youth Internet Addiction, the Choice Theory words stimulation of Reality Therapy made highly positive emotions and Internal Controls availability and they could adjust the internet themselves. Therefore, it is proposed that Youth Internet Addiction should be trained the Choice Theory words stimulation of Reality Therapy by a neuro-feedback and we need a follow-up study that they can reduce the frequency of internet use.