An information distribution system comprising: an external network having an event detection device configured to detect occurrence of a plurality of events and to designate distribution region information, which is a distribution region of event information, according to the events; and a mobile communication network having a service control device configured to receive the distribution region information from the event detection device, a broadcast distribution device configured to broadcast and distribute simultaneous transmission information on the events which have occurred to a mobile station present in the distribution region, and a gateway device configured to specify a distribution node that manages the mobile station that receives the simultaneous transmission information based on the distribution region information, and to notify the broadcast distribution device of the specified distribution node, wherein the gateway device is configured to notify the broadcast distribution device of information on the mobile station serving as a distribution destination of the simultaneous transmission information together with the distribution node, and the broadcast distribution device is configured to (i) notify the distribution node of the information on the mobile station serving as the distribution destination, and (ii) make the mobile station which received the information on the mobile station serving as the distribution destination, the information being transmitted from the distribution node, determine whether or not the received information is the simultaneous transmission information distributed to its own station. an external network having an event detection device configured to detect occurrence of a plurality of events and to designate distribution region information, which is a distribution region of event information, according to the events; and a mobile communication network having a service control device configured to receive the distribution region information from the event detection device, a broadcast distribution device configured to broadcast and distribute simultaneous transmission information on the events which have occurred to a mobile station present in the distribution region, and a gateway device configured to specify a distribution node that manages the mobile station that receives the simultaneous transmission information based on the distribution region information, and to notify the broadcast distribution device of the specified distribution node, wherein the gateway device is configured to notify the broadcast distribution device of information on the mobile station serving as a distribution destination of the simultaneous transmission information together with the distribution node, and the broadcast distribution device is configured to (i) notify the distribution node of the information on the mobile station serving as the distribution destination, and (ii) make the mobile station which received the information on the mobile station serving as the distribution destination, the information being transmitted from the distribution node, determine whether or not the received information is the simultaneous transmission information distributed to its own station. (i) notify the distribution node of the information on the mobile station serving as the distribution destination, and (ii) make the mobile station which received the information on the mobile station serving as the distribution destination, the information being transmitted from the distribution node, determine whether or not the received information is the simultaneous transmission information distributed to its own station.