A content playing device includes: an identifying unit to identify, with regard to subsidiary contents created by secondarily using contents as editing material and having playback control information instructing playback of actual content data of source editing material contents which are primary contents serving as source editing material, lacking primary contents which are the source editing material contents that are not included in held primary contents deemed to be held by a user; a sample content obtaining unit to externally obtain sample contents corresponding to the lacking primary contents; and a playback processing unit to execute, at the time of playing subsidiary contents following playback control information, playback signal processing for actual content data of held source editing material contents currently existing as the held primary contents regarding held source editing material contents, and playback signal processing for actual content data of corresponding sample contents regarding the lacking primary contents.