Access filtering device and access filtering method

An access filtering device includes a receiving unit that receives a URL of a prohibited site or a prohibited page; an executing unit that accesses the page by using the URL; an acquiring unit that acquires page information corresponding to the URL; a prohibited site list that includes character strings of prohibited sites and prohibited pages; a determining unit that determines whether the URL is a character string of a prohibited site or a prohibited page; a display control unit that, when the URL is a character string of a prohibited site or a prohibited page, displays the page in a decreased page-readability state, i.e., in a transparent state.