A content explaining apparatus and method computes the degrees of similarity between a specified content and the other contents than the specified content of multiple contents based on content information stored in content information database means, computes a user realization degree for each of the other contents based on user information stored in user management database means or the content information stored in the content information database means, computes an explanation accuracy degree of each of the other contents for the specified content from the similarity degree and user realization degree of said each of the other contents, and presents content explaining information for the specified content according to the explanation accuracy degrees.