PROBLEM TO BE SOLVED : To reduce initial investment cost and running cost for system development and the like, corresponding to individual facility, and to improve the efficiency and quality of business operations. SOLUTION : This facility management system is conducive to facility managing operations and administrative operations of a plurality of real estate properties through a communication network 1, that is connected to a user' s terminals, and comprises a database 5 that stores various data necessary for facility managing operations and administrative operations of a plurality of real estate properties; plural function realizing means 4 that realize various types of functions for performing facility managing operations and administrative operations of a plurality of real estate properties and to add or update a database; and access control means 2, 3 that authenticate each user, empower the user to use available functions, and control the user' s access to plural function realizing means. Each user terminal, through the communication network 1, can selectively access plural function realizing means 4, thereby improving the efficiency and quality of the business operations.