In this paper, using an Eye-movement tracking method, we investigated the effect of the two determining factors on the credibility of the review text: the polarity of text(i.e. positive, negative, or ambivalent) and the type of the alongside image(i.e. interior or exterior photo). The credibility of the text was generally high in ambivalent texts and when the ambivalent text was presented with the exterior photo, the credibility was higher than others. However, if the text was either positive or negative, the interior photo was more proper to improve the credibility. We concluded that the credibility of review text is highly dependent on the polarity of text and the types of the alongside image should be selected differently according to the polarity of the text.