Abstract: In a store providing system, an action history recording device records the action history of a user. A product information acceptor accepts information to identify content to be sold in a store. Here, the product information acceptor accepts the information to identify content included in the action history of the user in the action history recording device. A content disposing section disposes accepted information relating to content in the store. A target sales holder holds a target number of sales of content and a content price holder holds the price of the content. A price decider increases the price of the content if the counted number of sales is equal to or larger than the target number of sales, and decreases the price of the content if the counted number of sales is smaller than the target number of sales.

Abstract: There is provided a conversation aid device that can improve usefulness in foreign language conversations etc. The conversation aid device accessibly connects to a data base storing response sentence table correlating uttered sentence identification information for identifying uttered sentences with a reply sentence list enumerated as assumed responses to the uttered sentences, acquires a reply sentence list, correlated to spoken sentence identification information of the input spoken sentences, displays a list of reply sentences contained in the reply sentence list, and causes a respondent to selectively read aloud.

Abstract: The present invention provides a cationic starch prepared by roasting starch under the presence of a cationic polymer, a method for preparing the cationic starch, and a method for making paper board with the cationic starch. The method for making paper board of the present invention provides high retention of starch in paper board, enhances paper board strength in a high level and reduces a load of treating waste water from a paper machine, in comparison with the starch which has conventionally been employed for paper making.