The embodiment of the invention discloses a method and a system for monitoring terminal positions and the corresponding server and terminals. The method for monitoring the terminal positions comprises the following steps of: receiving a regional information subscription request transmitting by a first terminal, wherein the regional information subscription request comprises regional information which the first terminal requests to scribe and an identity identification number of a second terminal of which the position information is requested to scribe by the first terminal; detecting whether the second terminal enters the region subscribed by the first terminal or not and acquiring the position of the second terminal in the region; and feeding the position information of the second terminal back to the first terminal. Due to the implementation of the embodiment of the invention, the server can add description of the geographical position information of a terminal user when publishing the personal information of an instant communication terminal user, and can support the instant communication terminal user to subscribe the position information of other instant communication terminal users in a certain region at the same time. Conditions are supplied to realize application associated with user regional positions.