Now a day, the problems of long-time use of smartphones among youth has been sparked social debate. The long-time use of the Internet has been pointed out as one of the factors, so-called "internet dependence" in society. Although long-time use is regarded as a problem, actual use time has not been measured, and no discussion based on evidence. Furthermore, it has not been clarified how the use time of the Internet is related to the consciousness of dependence on the Internet. Therefore, this research tackled to clarify the problems from the standpoint of the screen time, for the problem of so-called Internet dependency. This research surveyed smartphone screen time and conducted a consciousness survey to high school students who are facing the problem of using the Internet for a long time. As a result of actual usage time measurement, the average usage time per day was 4.02 hours. However, an analysis of the relationship between the usage time and the consciousness of dependence revealed that were not necessarily related. From the results, it can be said that long-time usage problems and internet-dependent issues should be treated as separate policies. And then, with regard to the problem of long-time usage, it can be considered that measures to make them aware of long-time usage will be effective.
Nagayuki Saito, Keio University, Japan