1. An information processing device comprising: a CPU configured to implement a candidate attribute area identification portion configured to receive information associated with a cluster of at least one data item, and identify at least one named attribute area for each of the at least one data item; a relatedness assessment portion configured to perform a relatedness assessment between the cluster and each of the at least one named attribute area; and a cluster name generation portion configured to generate a cluster name based on the relatedness assessment, wherein said cluster name includes at least a part of one of the at least one named attribute area, and the relatedness assessment portion determines the relatedness assessment according to 
 E=n×D/S , where E is the relatedness assessment, n is a number of data items, D is an area overlap between attribute areas, and S is an area of a candidate attribute area, wherein the attribute area is at least one of a geographic attribute area, a temporal attribute area, and a music content attribute area.