A user data management apparatus for connection to a terminal data processor used by a user through a network, registers data that is dependent on a user ID peculiar to the user. The user data management apparatus has a first unit for generating a first data registration screen, when data of the user is to be initially registered, which differs from user ID to user ID, and a second unit for displaying, on the terminal data processor, a second data registration screen based on the first data registration screen generated by the first unit, when the data of the user is to be registered.