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Abstract

The present invention provides a technique for improving the security of access to contents. A virus/phishing site list contains a list of URLs of phishing sites, which masquerade as valid websites and are provided with an attempt to acquire private information including card numbers, PIN numbers and passwords, from users illegally. When a communication control unit receives, via a network, a packet that contains communication data for requesting access to a content, a search circuit compares the URL of the content to be accessed included in the communication data, with URLs of phishing sites included in the virus/phishing site list, regardless of the need for access control of the communication data. If the address of the content to be accessed matches a URL of a phishing site, a process execution circuit will prohibit the access to the content.

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First Claim