PROBLEM TO BE SOLVED: To determine change content of a document of which notification is highly needed as a notification object.SOLUTION: The notification object determination device 100 acquires change information indicating a point of time when any document among multiple documents to be changed is changed and change content. The notification object determination device 100 creates time series distribution of the number of changes for each change content based on the acquired change information, and supposes, for example, whether the considerable number of documents on which changing of the change content has not been performed remain or not, based on convergence tendency of the number of changes of the time series distribution. The notification object determination device 100, for example, when the considerable number of unchanged documents remain, determines that the holders of the multiple documents should be notified of the change content and should change the documents as quickly as possible, and determines the change content as a notification object.
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