Abstract: A related content retrieval device that can retrieve a wide variety of related contents. The related content retrieval device includes: an input unit for implementing input of a content; a metadata acquisition unit for acquiring metadata of the content input by the input unit; a posted text acquisition unit for acquiring a posted text related to the metadata acquired by the metadata acquisition unit, from a posting server accumulating user posted texts; a related content acquisition unit for acquiring a related content related to the posted text acquired by the posted text acquisition unit, from a retrieval server capable of retrieving a content on a network device; and an output unit for outputting the related content acquired by the related content acquisition unit.

Abstract: A communication terminal device includes an icon creation unit that creates an icon on a display screen for access to resources, the icon containing access destination information so that classification of the resources can be determined, a information storage unit that stores local resources, a resource viewing unit that acquires and outputs resources in response to a selection input of the icon, and an icon use information transmission unit that transmits icon use information for the selected and input icon to an accounting server device together with access destination information as information from which classification of the resources can be determined, in which the resource viewing unit acquires the network resources based on redirection information received from the accounting server device when the selected resources are the network resources, and acquires the local resources from the information storage unit when the resources are the local resources.

Abstract: A data search system 1 conducts a search through a plurality of pieces of search target data to which at least date and time information is attached as attached data. The data search system includes search means for searching the plurality of pieces of search target data for keyword-matching data including a search keyword, and extracting, as a linked search keyword, the date and time information on a time period that is included in the attached data attached to the keyword-matching data, linked search means for searching the plurality of pieces of search target data for whether there exists linked matching data to which attached data including a time period that is close to the time period of the linked search keyword is attached, and output means for outputting the keyword-matching data and the linked matching data.

Abstract: A content evaluation apparatus and a content evaluation method that can distribute contents that a user potentially needs without any omissions. A history class separation unit generates a separation plane for separating in a separation plane a characteristic vector of a selected content and characteristic vectors of non-selected contents stored in a browsing history table. A user characteristic vector calculation unit generates a user characteristic vector based on an orthogonal vector perpendicular to the separation plane thus generated and stores the user characteristic vector in a user characteristic vector management table. Subsequently, when a recommendation request receiving unit receives a recommendation request, a content evaluation unit evaluates the contents based on the stored user characteristic vector.

Abstract: A recommendation information generation apparatus and a recommendation information generation method that can select a similar user appropriately even if the amount of history information is small. In an information distribution server, a user characteristic vector calculation unit calculates a user characteristic vector of each of users, and a similar user calculation unit calculates the degree of similarity between the users based on the calculated user characteristic vector of each of the users. The similar user calculation unit then selects a similar user who is similar to a first user based on the calculated degree of similarity. A relevance evaluation unit generates recommendation information for the first user based on the characteristic vector of the selected similar user.

Abstract: A content evaluation apparatus and a content evaluation method that can distribute contents that a user potentially needs without any omissions. A history class separation unit generates a separation plane for separating in a separation plane a characteristic vector of a selected content and characteristic vectors of non-selected contents stored in a browsing history table. A user characteristic vector calculation unit generates a user characteristic vector based on an orthogonal vector perpendicular to the separation plane thus generated and stores the user characteristic vector in a user characteristic vector management table. Subsequently, when a recommendation request receiving unit receives a recommendation request, a content evaluation unit evaluates the contents based on the stored user characteristic vector.

Abstract: A recommendation information generation apparatus and a recommendation information generation method that can select a similar user appropriately even if the amount of history information is small. In an information distribution server, a user characteristic vector calculation unit calculates a user characteristic vector of each of users, and a similar user calculation unit calculates the degree of similarity between the users based on the calculated user characteristic vector of each of the users. The similar user calculation unit then selects a similar user who is similar to a first user based on the calculated degree of similarity. A relevance evaluation unit generates recommendation information for the first user based on the characteristic vector of the selected similar user.