"Cyber terrorism" is what to attack that damages an important system of the society and the enterprise to use the Intranet.
Because damage equal with the terrorist attack that destroys an actual thing might be received, it is danger.
In addition, because cyber terrorism does not need arms that the perception of a prior attack is very difficult, and special (gun and bomb, etc.), there is no evidence, and the criminal's perception is also difficult.
It is necessary to have these as knowledge though measures in the individual against cyber terrorism are impossible near.