Patent ID: 8341261

Claim:
A messaging server device, comprising: a manager for receiving and managing a status of equipment or a user operating the equipment as status information, and detecting a load status of the messaging server device; a notification request receiver for receiving a notification subscription message from a reference person terminal subscribing a notification of the status information when a status change event occurs; a notification response transmitter for transmitting a notification response message responding to the received notification subscription message; and a status notification transmitter for transmitting a status notification message including the status information received by the manager to the reference person terminal, when the status change event occurs, once after receiving the notification subscription from the reference person terminal, in which transmission of the status notification message is limited according to the load status of the messaging server device, wherein: limiting the transmission of the status notification message according to the load status of the messaging server device includes suspending the transmission of the status notification message to the reference person terminal for a predetermined time when the manager detects an overload state of the messaging server device, wherein the reference person terminal does not receive the status notification message during the suspension, and transmitting the status notification message to the reference person terminal after a release of the suspension or discarding the status notification message after the release of the suspension, and as a predetermined suspending time of the status notification transmitter, the suspending time is set based on the level of the load status of the messaging server device.