Information on VDT (Visual Display Terminal) is tend to be often printed as hardcopy only for the purpose of getting more comfortable reading conditions. Electric mail with large volume of texts, for instance, is frequently printed wastefully. The concept of Digital Paper, which has combined merits of softcopy and hardcopy, is recently proposed to solve these problems including ecological items. This study aims at comparison of operation efficiency between hardcopy work and softcopy work. Our goal is to clarify the reason why hardcopy work is generally comfortable for human, and to know human-interface requirements for the Digital Paper.