An attack countermeasure determination includes a domain name input unit that receives any domain name as input, and acquires setting information corresponding to the domain name, registration information corresponding to the domain name, and external information corresponding to an internet protocol (IP) address corresponding to the domain name, as feature information on the domain name, an attack countermeasure determination unit that specifies a pre-designated category for the domain name on the basis of the feature information and determines, in a stepwise manner, an attack countermeasure against the domain name in accordance with the specified category, and an attack countermeasure information output unit that outputs attack countermeasure information corresponding to the attack countermeasure.
展开▼
