This study is to discover the functions of customer emotion in highly involved and information intense buying decision process. This study used smart networking devices (ex. smart phones), which falls into expensive commodity category in its acquisition and use. Known through many other previous studies, information tends to trigger emotional responses. However, this study, assumed emotion also as information, tried to find emotion-triggered consumer responses in buying the products. The results lighted the finding that emotion as information helped to form positive interests on products as well as positive emotion on products. Unlike the previous studies on positive connection between interests and product/service value evaluation, interests triggered by emotion in this study did not show any connection between them. The phenomenon stretched to the relationship between interests and consumer needs. Although the study was only about smart device buyers’ emotional responses, it became obvious that emotion as information majorly works through a limited path when consumers form their buying intention. Based on the findings, ideas of promotion and communication activities that are designed to work around emotion-triggered-buying (a.k.a. impulsive buying) may need to have a better and closer examination to further clarify the cause and effect relationship. The part may need further studies.