1. An intrusion detection system for quantifying a value within a low to a high range of values, which allows a user to take appropriate counter measures before a cyber threat occurs, the system comprising: a processor and a memory, the memory having stored thereon: 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, information from at least one to a plurality of first persons in response to predetermined questions asked related to at least one or more cyber threats, wherein the cyber threat information of the internet bulletin board is configured to be automatically collect information from predetermined articles on each of the at least one or more cyber threats from at least two or more predetermined Internet bulletin boards at predetermined time intervals prior to generating the predetermined questions for each of the respective cyber threats; a engine sub-system for allowing the user to take the appropriate counter measures before the cyber threat actually occurs by using at least one of a time-series analysis method and a Delphi method according to the collected and processed information; a database (DB) management module for storing and managing the collected and processed information of the engine sub-system, wherein each of the at least one to the plurality of first persons provide the respective information in response to the questions asked about the cyber threats is represented by a statistical value, wherein the statistical value is configured based on quantifying quantitative answers to at least one or more questions received from each of the at least one to the plurality of first persons respective information to generate a degree of the predicted occurrence of the cyber threat before the cyber threat occurs, wherein the degree of the quantified quantitative answer ranges from a most selected answer to a least selected answer, wherein the engine sub-system applies the time-series analysis of information on the intrusion detection event and the statistical information on network traffic with the generated degree of the quantified quantitative answers ranging from the most selected answer to the least selected answer to generate a value within the range of values for allowing the user to take the appropriate counter measures before the cyber threat occurs, wherein a low value indicates a low probability that the cyber threat will occur and a high value indicates a high probability that the cyber threat will occur; and a result display graphic user interface (GUI)-management module for displaying the generated value within the range of values for allowing the user to determine whether take the appropriate counter measures before the cyber threat occurs of the engine sub-system on a screen.