Recently, with the expansion of digital activities in daily lives, lots of discussions have been made about a newly-risen IT generation. Through its personalities and behaviors, the new generation is expected to play a key role in setting a direction and bringing about social changes in a knowledge-information society. Naming the new group as a digital generation, this paper empirically analyzes who they are, what values they have and what personalities they have, especially compared to other generations. Based on the results of the research, we elicit a 'digital index' by considering the levels of access, usage, production and circulation of the digital machinery and services. According to the digital index, we come up with post-digital, digital, semi-digital and analogue generations, and then comparably analyze characteristics of those generations. Main findings of the study are as follows. Post-digital and digital generations showed high levels of willingness of access, usage, production and circulation of digital tools and content. And the higher the levels of their access, usage, production and circulation are, the more likely they are open-minded, active and participation-oriented.