Abstract: A non-transitory computer-readable storage medium storing a program that causes a computer to execute a process, the process including obtaining reference counts that are numbers of times respective pieces of content were referred to, classifying the pieces of content into a plurality of groups based on the reference counts, selecting one or more feature phrases from each of the pieces of content based on appearance frequencies of words included in each of the pieces of content, and extracting first content that includes a feature phrase which is included in all of the plurality of groups, wherein the feature phrase is any one of the one or more features selected by the selecting.