| 摘要 |
The present invention relates to technology for managing group members and, more specifically, to a terminal, a method, and a system for managing group members which enable a user to immediately check a group member who leaves from the group so as to promote convenience of checking the number of people, and enable the user to immediately recognize a group-leaver when a group member leaves from the group so as to prevent group members from unintentionally leaving the group and falling behind. The terminal of the present invention comprises: a Zigbee communications module which performs Zigbee communications; an ultrasonic communications module which performs ultrasonic communications; and a communications change determination unit which controls to transmit a signal to a lead terminal through ultrasonic communications when it is determined that the terminal itself is in water, and to transmit the signal to the lead terminal through Zigbee communications when it is determined that the terminal itself is on the ground. |
