Kyungdong One Corporation

Wang Ki Lee

Sin Dae Choi

Methods, devices, and systems are provided herein related to a connection management server connected to a signaling server, a push server, at least one home device, and at least two smart devices. The connection management server includes a connection management request receiver for receiving a video call connection request or a user switching request. A connection management request transmitter is also included for transmitting a connection state releasing request to the home device and the first smart device, for transmitting a video call push notification transmission request to the push server upon the video call connection request, and for transmitting a user switching push notification transmission request to the push server upon the user switching request. A group manager is also included for managing, in a group, smart device identity corresponding to a push notification sent from the push server.

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Seoul, South Korea

Wang Ki Lee