1. A corpus generation device for generating accurate corpus data of presentation targets for use in a search operation for the presentation targets, the corpus generation device comprising: at least one non-transitory memory configured to store computer program code; and at least one processor operable to access said memory and execute said computer program code, said computer program code comprising: web page acquisition code configured to cause at least one of said at least one processor to acquire a web page including description sentence data regarding a presentation target; reference word acquisition code configured to cause at least one of said at least one processor to acquire a reference word that is an attribute value regarding the presentation target from the web page; attachment code configured to cause at least one of said at least one processor to extract a broader word belonging to a layer above the reference word acquired according to the reference word acquisition code from a storage configured to store hierarchical relationship information indicating a hierarchical relationship between attribute values, and to attach an attribute tag, indicating an attribute name, corresponding to the reference word to the broader word included in the description sentence data when the broader word is included in the description sentence data; and output code configured to cause at least one of said at least one processor to output, as corpus data, the description sentence data to which the attribute tag is attached in accordance with the attachment code, wherein the corpus generation device further comprises a presentation target information registration storage configured to store a set of the attribute name and the attribute value regarding the presentation target generated by machine learning using the corpus data output in accordance with the output code in association with the web page, and wherein, when a search for the presentation target is requested, the presentation target is searched by referring to the presentation target information registration storage based on the attribute name and the attribute value regarding the presentation target.
1. A corpus generation device for generating accurate corpus data of presentation targets for use in a search operation for the presentation targets, the corpus generation device comprising: at least one non-transitory memory configured to store computer program code; and at least one processor operable to access said memory and execute said computer program code, said computer program code comprising: web page acquisition code configured to cause at least one of said at least one processor to acquire a web page including description sentence data regarding a presentation target; reference word acquisition code configured to cause at least one of said at least one processor to acquire a reference word that is an attribute value regarding the presentation target from the web page; attachment code configured to cause at least one of said at least one processor to extract a broader word belonging to a layer above the reference word acquired according to the reference word acquisition code from a storage configured to store hierarchical relationship information indicating a hierarchical relationship between attribute values, and to attach an attribute tag, indicating an attribute name, corresponding to the reference word to the broader word included in the description sentence data when the broader word is included in the description sentence data; and output code configured to cause at least one of said at least one processor to output, as corpus data, the description sentence data to which the attribute tag is attached in accordance with the attachment code, wherein the corpus generation device further comprises a presentation target information registration storage configured to store a set of the attribute name and the attribute value regarding the presentation target generated by machine learning using the corpus data output in accordance with the output code in association with the web page, and wherein, when a search for the presentation target is requested, the presentation target is searched by referring to the presentation target information registration storage based on the attribute name and the attribute value regarding the presentation target. 3. The corpus generation device according to claim 1 , wherein the web page further includes an attribute list in which the attribute name and the attribute value regarding the presentation target are associated, and wherein the reference word acquisition code is further configured to cause at least one of said at least one processor to acquire the attribute value in the attribute list as the reference word.