A smartphone allows access to online information sources anywhere, can be used for spending free time, and enables building relationships in the cyber space. These advantages of a smartphone attract more and more people to use smartphones. In particular, the excessive use of smartphones may cause a diseased condition, i.e. smartphone addiction, that a user cannot control his/her smartphone use. Existing studies show that smartphone addiction is more serious in the young generation that has a higher ratio and relatively more hours of smartphone use. College students in adulthood are expected to have more control over smartphone use compared to elementary, meddle, and high school students, but the rate of smartphone addiction among college students turned out to be fairly high at 24.8-27.8%[1][2]. In addition, higher level of smartphone addiction had a greater negative impact on academic achievement, school life, mental health, communication between parents and children, and personal relationship due to lower sociality[3][4]. Thus, smartphone addiction should not be deemed a personal problem, and active guidance on smartphone use is needed.