1. A system for predicting a cyber threat, providing prediction information on the cyber threat and allowing a user to prepare against the cyber threat, the system comprising: an information collection/processing module for collecting and processing at least one of information on an intrusion detection event, statistical information on network traffic, cyber threat information of an Internet bulletin board, expert-opinion information on an occurrence of the cyber threat; a prediction engine sub-system for predicting a frequency, possibility and time of the occurrence of the cyber threat using a time-series analysis method or a Delphi method according to the processed information; a database (DB) management module for storing and managing the processed information and the prediction result of the prediction engine sub-system; and a result display graphic user interface (GUI)/management module for displaying the prediction result of the prediction engine sub-system on a screen, and changing and managing configurations of the prediction engine sub-system and the information collection/processing module.