1. An information processing device, comprising: at least one memory operable to store program code; at least one processor operable to read the program code and operate as instructed by the program code, the program code including: base word acquisition code configured to cause the at least one processor to acquire a base word to be a base; compound word acquisition code configured to cause the at least one processor to acquire a compound word in which the base word acquired by the base word acquisition code becomes a modifiee from a compound word storage; classification item acquisition code configured to cause the at least one processor to acquire classification items to classify the compound word acquired by the compound word acquisition code by referring to a classification item storage, the classification item storage storing predetermined classification items that are set in advance; feature information acquisition code configured to cause the at least one processor to acquire feature information about a feature that provides a clue to classify the compound word acquired by the compound word acquisition code by referring to a feature information storage; compound word classification code configured to cause the at least one processor to distribute the compound word containing the base word into the classification item acquired by the classification item acquisition code, the classification item being set in advance and stored in the classification item storage, using a classification model generated in advance and the feature information acquired by the feature information acquisition code for the compound word acquired by the compound word acquisition code; base word related information acquisition code configured to cause the at least one processor to acquire base word related information containing a plurality of elements related to the base word based on the base word; base word related information classification code configured to cause the at least one processor to classify each of a portion of the elements contained in the base word related information acquired by the base word related information acquisition code into one of the classification items in accordance with a classification result by the compound word classification code; and output code configured to cause the at least one processor to output, to be displayed on a screen of a display of a user terminal device, the base word related information classified by the base word related information classification code along with an indication of the classification item into which the base word related information is classified.