The purpose of this study is to identify the most efficient expression method by analyzing advertising expression method by 16 types of product in internet advertising. First of all, It made inquiries about expression method and attitude of internet advertising for this study and identified a conception, characteristics, and types of internet advertising through literature reviews about internet advertising. This study offered expression the korean alphabet, hangout about banners ads, sponsorship ads, interstitial ads and pop-up ads. This study analyzed advertising expression, advertising effectiveness and advertising attitude by 16 types of product in internet advertising. In conclusion, the marketers of internet advertising have to effort to make internet advertisements that suit their advertising purpose by using the right expression method of internet advertising because they know internet advertising are quite different the expression method, advertising effectiveness, and advertising attitude. And they have to convert negative attitude or medium size attitude of internet advertising into positive attitude in the future.