The present invention relates to a sports activity and accident risk monitoring system and a method thereof. The system includes a wearable sensing device that is as worn by a user and is capable of sensing an activity state of the user; a terminal capable of processing activity information in conjunction with the wearable sensing device; and a server that is connected to the terminal through a network, grasps a sports activity pattern, personal data for each item, and whether or not an accident occurs by receiving, processing, and analyzing the activity information of the user, and transmits a feedback signal to the terminal.