Also, all users can readily experience various types of functions, which is advantageous in that the use of the function modules are promoted in a natural manner. [0456] (2-8-3) Usage Restrictions on Test-Use Function Modules [0457] Now, the function modules that are provided from the first user 801 as described above and installed in the ???FRIEND TOOLS??? at the second user 802 side, are in a ??