The object of the present invention is to provide a user authentication apparatus that is easy for the user of a mobile wireless communication terminal to use and that makes it possible to authenticate a user reliably, and to provide a method of controlling this apparatus. After authentication (S25) is performed based upon a user ID and password, e-mail that has been made to include a temporary URL that is valid for a fixed period of time is transmitted to a mobile station 11 (S30). The mobile station 11 is authenticated by determining (S32) whether it has accessed the temporary URL within the period of validity.

 
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