The present invention relates to a system for a cloud streaming service, a method for a still image-based cloud streaming service and an apparatus therefor. The still image-based cloud streaming service can be provided by capturing the changed area in the changed frame by comparing same with the previous frame, selecting a still-image compression technique by considering any one or more from among the size of the changed area and image characteristics, and transmitting, to a user, the changed area encoded by the still-image compression technique. When providing a still image-based cloud streaming service, by utilizing still-image compression techniques which are appropriate to the conditions, the compression efficiency of the still image and speed of the cloud streaming service can be improved.