The present invention relates to a user terminal, cloud device and virtualization method in which a user terminal transmits a system profile to a cloud apparatus for generating a list of candidate screen visualization techniques from system profile information transmitted from the terminal, checks an apparatus loading amount and processing possibility for each technique, and determines an optimal screen visualization technique candidate on the basis of an available resource of an apparatus and a system profile of a terminal according to web service possibility and video streaming processing possibility. The system profile information includes web browser performance, video streaming replay function, RDP and VNC client driving possibility, network status, resolution and requesting service. The cloud apparatus receives the system profile information from the user terminal, generates a list of candidate screen visualization techniques, checks an apparatus loading amount and processing possibility to determine a screen visualization technique.