A method for providing an idle mode service uses an idle mode service server system interlocking with a contents provider server and at least one mobile communication terminal. State information is received from the at least one mobile communication terminal, and a push message is transmitted to the at least one mobile communication terminal in consideration of the sate information upon receiving a push message transmission request from the contents provider server. Thereafter, contents are transmitted to the at least one mobile communication terminal according to the push message transmission. Also, specific contents can be provided with or without the request and consent of a user. Consequently, the system and method according to the present invention can control an idle-screen application through a combination between interworking systems.