As science, technology is vertically advanced or horizontally combined with information and communication technology. The boundaries are broken down in all areas of physical, biological space, and cyberspace, connecting all objects in the world. Cyber battlefields are becoming more complex and intelligent in the future, so it is not possible to dominate cyber battlefields with the current cyber warfare strategy and security technology. Future cyber warfare strategy should be conceived considering the change of cyber battlefield environment and the new functions of cyber-attack tools, assuming that new science technology and information & communication technology are applied to cyber battlefield. First, we predict the change of cyber battlefield environment and the evolution of... cyber-attack technology, according to the development level of current information & communication technology and we propose a cyber warfare strategy in aspect of strategic, operational, and tactical levels that can prevent future advanced cyber threats.