The purpose of this paper is to demonstrate the effect of political efficacy in political action in terms of electoral participation and voting behavior. First, the findings show that internal efficacy, which causes citizens to engage in electoral participation, is an important factor. Second, in terms of voting behavior, I have found that the citizens who experienced a higher degree of responsiveness from the government (external efficacy) tended to support the ruling party in the 2001 legislative election when other variables that are likely to influence citizens' voting behavior are controlled. In conclusion, I interpret the theoretical implications of the effect of political efficacy. Moreover, I try to provide some applied suggestions to the comparative approach in terms of cross-section data by means of the empirical approach.