The invention above in that, the client computer address book and calendar manager service system the predetermined information with the service registration of the user provided to a user uses on a mutual information to a method of providing over the Internet according to the schedule information of a user navigate to the user's schedule information, and is, as to generate derived navigation mutual information in the schedule information, so as to provide a suitable time and place to the user, enhanced convenience by the user using the mutual information service as well as the user and to provide a new mutual information suited to changes of user information and calendar information without any operation to which to further improve the convenience of the user.
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