The present invention relates to a helmet and a method for dealing with an accident using the helmet, which the helmet includes: a helmet body part made of a resin having a semi-spherical space for receiving the head of a wearer; a light part arranged in the front of the helmet body part having LEDs mounted on a substrate to provide the wearer with lighting; a metallic heat radiator extending from the front of the helmet body part to the back thereof along the upper central line of the helmet body part and partially contacting the back of the substrate to discharge heat; a communication device part received in the helmet body part for dealing with communication and emergency circumstances; and a battery received in the helmet body part for supplying power to the communication part and light part. According to the present invention, the metallic heat radiator is integrated with the resinous helmet body part by injection molding of different materials, so that the heat generated from the LEDs of the light part is discharged upwards from the top of the helmet, thus preventing the wearer from being subjected to the discomfort caused by the heat generated from the LEDs.