Abstract: The present invention relates to a method for providing a mixed reality service by a server and a system for performing the same, the method comprising the steps of: generating a mixed reality conference room for arbitrary three-dimensional modeling data; receiving tracking information collected by at least one terminal participating in the mixed reality conference room; generating a virtual image for the three-dimensional modeling data and at least one object, on the basis of the tracking information; and transmitting the virtual image to the at least one terminal, wherein the tracking information includes space identification information of a reality space of each terminal and motion information of each terminal, and the virtual image is synthesized with a reality image in the at least one terminal so as to be displayed as a mixed reality image.