A content item recommendation device includes; a storage which stores information of a plurality of content items describing identifiers and usage characteristics of the resources used in the content items; a first specifying unit which specifies first content items which use at least S number of resources in common with a specified content item; a second specifying unit which specifies second content items which use at least K number of resources in common with each of the first content items; a calculator which calculates relationship levels between the specified content item and each of the second content items; a selector which selects recommended content items from the second content items based on the relationship levels.