Mobile convergence has brought about many changes in the modern society. Especially, combining strengths of existing mobile phones and PDA functionality, smart phone is able to overcome the time and location limitations that existing desktop did not meet. This study tried to examine factors influencing intention to use of smart phone based on the theoretical studies on technology acceptance model. Applying to smart phones relevant theoretical relations extracted from previous theoretical research background on mobile devices, mobility, interactivity, innovativeness, social influence and job fitness were selected as independent variables of acceptance factors of smart phone and then research model and hypotheses were established by using these variables. To verify the hypothesis on whether smart phone acceptance factors have a significant influence on perceived ease of use and perceived usefulness, innovativeness was in significant influence on perceived ease of use, social influence was in significant influence on perceived usefulness and mobility and interactivity were in significant influence on both variables. As a result of analysis on perceived usefulness and intention to use, the mediating variables of perceived ease of use was in significant influence on perceived usefulness and perceived usefulness was in significant influence on intention to use.