6. The content reproduction device according to claim 5 , wherein the one or more memory devices stores instructions that further cause the one or more processing devices to: with reference to use history data including, in association with each other, (i) information on the plurality of databases and (ii) frequency information indicative of a frequency of searches run with use of each of the plurality of databases, generate the priority data so that the priority data sets a higher priority for a database having a higher frequency of searches.
6. The content reproduction device according to claim 5 , wherein the one or more memory devices stores instructions that further cause the one or more processing devices to: with reference to use history data including, in association with each other, (i) information on the plurality of databases and (ii) frequency information indicative of a frequency of searches run with use of each of the plurality of databases, generate the priority data so that the priority data sets a higher priority for a database having a higher frequency of searches. 7. The content reproduction device according to claim 6 , wherein the one or more memory devices stores instructions that further cause the one or more processing devices to: generate the use history data by counting, for each of the plurality of databases, the number of searches run by the search step.