PROBLEM TO BE SOLVED: To provide a web API update information management device capable of detecting an update of a web API (World Wide Web Application Program Interface) on a server and automatically notifying a terminal device at a user side of the same to thereby check the update free from human work.SOLUTION: In a network system 10, each of a plurality of user terminals 14 to 16 sharing a web API (API) with respect to servers 11 to 13 disclosing a predetermined function on the API receives a response as a request. An update information management device 20 includes an information table 21 which stores the content of the API, the content of a request item, and the content of a response item for each program of a plurality of users A and B at predetermined intervals. The update information management device 20 notifies the terminals 14 and 15 of the users A and B sharing the API in which an update of the content of the API of each of the users A and B is detected from among the information of the users A and B who have the same content of the request item and the response item between the users A and B in the information table 21 of the update of the content of the API.SELECTED DRAWING: Figure 1
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