The present invention relates to a system for a cloud streaming service, a method for same using a still-image compression technique and an apparatus therefor, particularly the method allowing a still image-based cloud streaming service by comparing the previous frame and current frame to determine and capture the region in the current frame which has changed from the previous frame, and transmitting, to a user, the changed region encoded with the still-image compression technique. By utilizing a still-image compression technique appropriate to the image type when providing the cloud streaming service, the compression efficiency of the still image and the speed of the cloud streaming service can be improved.