The information processing device includes an access history acquiring unit which acquires and stores access history information showing access history for the contents accessed by a user terminal, and a relevancy setting unit which relates the accessed contents. As the access history information, the access history acquiring unit acquires content identification information, access date and time information, and application identification information for identifying a content access application making access to the content, which is different for each of the content access applications operated on the user terminal. The relevancy setting unit generates and stores the relevance information by mutually relating the content identification information based on the access date and time information and the application identification information contained in each of the different contents.