Emergency notification system and server

An emergency notification server comprising:

• a transceiver that periodically receives, from a first mobile device, biosignals and an intensity of an adjacent signal between the first mobile device and a wearable device that senses the biosignals;
• and
• a controller that determines whether an emergency situation has occurred, based on the received biosignals, generates an emergency signal requesting the first mobile device to provide data comprising a most recently received sound and image, when the intensity of the adjacent signal is less than or equal to a preset value or when the emergency situation has occurred, and controls the transceiver to transmit the emergency signal to the first mobile device or to transmit the emergency signal and the data to a second mobile device.

A mobile device that is wirelessly connected to a wearable device, the mobile device comprising:

• a transceiver that periodically receives, from the wearable device, at least one of biosignals sensed by the wearable device and environment data captured by the wearable device, and that periodically transmits the received at least one of the biosignals and the environment data to a server;
• and
• a controller that requests the wearable device to provide the at least one of the biosignals and the environment data, determines whether an emergency situation has occurred, based on the received at least one of the biosignals and the environment data, and controls the transceiver to transmit an emergency signal to the wearable device, when the emergency situation has occurred.