5. The related-word registration device according to claim 1 , wherein the obtained search query in the search query obtaining code is stored in the search query storage in association with user identification information and acquisition time of the search query, the second search query specifying code causes at least one of said at least one processor to specify a second search query whose acquisition time is earlier than acquisition time of the first search query, from the extracted search queries, wherein the second search query specifying code causes at least one of said at least one processor to specify, as a second search query, a search query whose acquisition time is earlier than acquisition time of the first search query and having continuity based on the acquisition time in the extracted search queries, wherein the second search query specifying code causes at least one of said at least one processor to specify, as a second search query, search queries whose interval of acquisition times is within second predetermined time in the extracted search queries.
1. A related-word registration device comprising: at least one memory operable to store computer program code; at least one processor operable to access said at least one memory and operate as instructed by said program code: search query obtaining code that causes at least one of said at least one processor to obtain a search query including a search word entered by a user; search query extracting code, in the case where a predetermined user operation different from a search is detected, that causes at least one of said at least one processor to extract search queries corresponding to the user identification information of the user from a search query storage that stores the obtained search query in association with the user identification information; first search query specifying code that causes at least one of said at least one processor to specify a first search query from the extracted search queries; second search query specifying code that causes at least one of said at least one processor to specify, as a second search query, a search query different from the first search query from the extracted search queries; related-word registering code that causes at least one of said at least one processor to register, as related words, a search word in the first search query and a search word in the second search query into a related-word database; and moving picture reproduction characteristic value calculating code that causes at least one of said at least one processor to detect moving picture reproduction information as the predetermined user operation and calculate a moving picture reproduction characteristic value on the basis of the reproduction information.