This study employs the ”2004 Taiwan's Election and Democratization Study” (TEDS 2004) survey data to examine the extent to which using the internet to gain campaign information influences political efficacy, political knowledge, campaign interest, campaign participation, and voting behavior. The study also tries to compare the effects of the internet and other traditional media and interpersonal communication during the legislative election. Results show that internet use is not related to political attitudes and voting behavior. However, it is the only medium which can significantly predict campaign participation variables. Internet users are more likely than the average citizens to donate money to candidates and to attend campaign rallies.