There are three measurement scales. The scale of brand image was adopted from Park, Jaworski and Maclinnis, including 6 questions [11]; the scale of credibility of the spokesperson was adopted from Ohanian, containing 5 questions [18]; and the scale of the effect of advertising is from Bower and Landreth [3], including 8 questions. The questionnaire is 6-point Likert scale used to examine the participants how they feel and judge about the variables.