Information spill was occurred several times in the country due to the negligence of the large internet
service providers including SK Communications, Auction, KT. In order to judge the Internet Service
Provider(ISP)'s liability in individual data spill caused by hacking, the violation of existing legislation or
general principle of law's good faith principle has to be examined. However, based on current ISP's good
faith principle, there is no objective standard for judging liability. Such uncertain range of protection action
duty based on good faith principle generates complaint toward companies, therefore presentation of objective
judgement range index on how to determine this range is needed. However due to the legal characteristic
of above-mentioned law, it is not possible to fix the range of protection action duty and regulate it on
law. In order to resolve this, rather than concerning simply on legal system level, fusion approach method
is needed. Thus, this research will discuss the measure for objective standard for predicting ISP's range of
protection action duty through fusion view dividing in technical, legal and administrative aspects.