9. The display control apparatus according to claim 8 , wherein the display control unit is configured to display representative contents of each cluster before other contents of the corresponding cluster.
9. The display control apparatus according to claim 8 , wherein the display control unit is configured to display representative contents of each cluster before other contents of the corresponding cluster. 13. The display control apparatus according to claim 9 , wherein the display control unit is configured to: insert the other contents of the corresponding cluster between the representative contents of each cluster, and display the other contents of the corresponding cluster.