1. A method of generating a log for a multi-user application, said multi-user application being used by a plurality of users, said method comprising: receiving a level data indicating association of each of a plurality of log levels with a corresponding one of said plurality of users; and including in said log a first amount of information based on a first log level contained in said plurality of log levels when said multi-user application is used by a corresponding first user contained in said plurality of users, wherein said first log level is associated with said first user.