This study investigates the differences in advertisement attitude, brand attitude, and purchase intention based on advertising model and consumer product involvement. A total of 100 respondents in high involvement and 100 respondents in low involvement categories were exposed to the advertisements of a cosmetic brand using 4 different model types: celebrity endorser, expertise endorser, ordinary person as an endorser, and no endorser. The experiment was planned as $2{ imes}4$ types including high/low involvement and 4 different model types (25 respondents each). After looking at an advertisement for 1 minute, respondents were asked to answer a survey measuring advertisement attitude, brand attitude, and purchase intension. The results of this study showed that 6 hypotheses were supported and there was a significant difference between the high involvement and low involvement group depending on the advertising models used as well as the advertisement that influence advertisement attitude, brand attitude, and purchase intension. High involvement consumers showed the most favorable advertisement attitude on an advertisement with an expertise endorser, but low involvement consumers showed the most favorable advertisement attitude on an advertisement with a celebrity endorser. High involvement consumers showed the most favorable brand attitude on an advertisement with an expertise endorser whereas low involvement consumers showed the most favorable brand attitude on an advertisement with a celebrity endorser. High involvement consumers showed the highest purchase intention on an advertisement with an expertise endorser whereas low involvement consumers showed no difference in purchase intention depending on advertisement models. This study shows that marketers should differentiate advertising strategies based on consumer involvement.