The study seeks to identify changes in overall picture of domestic Internet use and socio-demographic groups that led to that change based on the survey results of 2002, a period when the internet has become widely available and 2005. In addition to that, the study also examines general trends and changes in Internet use by pinpointing aspects of changes and groups leading the changes during the same period according to ten major Internet activities. As a result, Internet usage rate has increased by 99.6 percent in Korea over the last three years. Dependency rate and engagement rate have risen by 50.7 percent and 36.7 percent respectively, higher growth rates compared to Internet connection rate of 22.6 percent during the same period. The socio-demographic groups that took the lead in the growth have turned out to be women and people in their 10s and 20s. In regional perspective, small cities and rural areas have shown a relatively high growth in Internet use, dependency and experience while Seoul and the other large metropolitan areas have registered a steeper rise in engagement rate. In terms of Internet activities, e-shopping has recorded the highest engagement rate followed by current e-news and work-related use. e-school, online games, online friends and e-government have all grown twice as much as in 2002.