A vehicle terminal device installed in a vehicle, the vehicle terminal device comprising: a first communicator configured to communicate with a passenger terminal device included in the vehicle using a first wireless communication to receive passenger information from the passenger terminal device, wherein the passenger information comprises a plurality of information items; a second communicator configured to communicate with an apparatus outside the vehicle using a second wireless communication; a detector configured to detect state information of the vehicle; and a controller configured to: determine whether an accident involving the vehicle has occurred based on the state information of the vehicle; when it is determined that the accident has occurred, control the second communicator to broadcast an accident alert message for alerting of the accident to at least one of an apparatus included in an adjacent vehicle or a traffic management device, when it is determined that the accident has occurred, determine an accident level based on the state information of the vehicle, and control the second communicator to transmit, to an external server, one or more information items of the passenger information received from the passenger terminal device included in the vehicle based on the determined accident level, wherein the transmitted one or more information items comprising: emergency contact and human information among the received passenger information when the accident level is a first level; emergency contact, blood information, and medical history information among the received passenger information when the accident level is a second level; and all the received passenger information when the accident level is a third level. a first communicator configured to communicate with a passenger terminal device included in the vehicle using a first wireless communication to receive passenger information from the passenger terminal device, wherein the passenger information comprises a plurality of information items; a second communicator configured to communicate with an apparatus outside the vehicle using a second wireless communication; a detector configured to detect state information of the vehicle; and a controller configured to: determine whether an accident involving the vehicle has occurred based on the state information of the vehicle; when it is determined that the accident has occurred, control the second communicator to broadcast an accident alert message for alerting of the accident to at least one of an apparatus included in an adjacent vehicle or a traffic management device, when it is determined that the accident has occurred, determine an accident level based on the state information of the vehicle, and control the second communicator to transmit, to an external server, one or more information items of the passenger information received from the passenger terminal device included in the vehicle based on the determined accident level, wherein the transmitted one or more information items comprising: emergency contact and human information among the received passenger information when the accident level is a first level; emergency contact, blood information, and medical history information among the received passenger information when the accident level is a second level; and all the received passenger information when the accident level is a third level. determine whether an accident involving the vehicle has occurred based on the state information of the vehicle; when it is determined that the accident has occurred, control the second communicator to broadcast an accident alert message for alerting of the accident to at least one of an apparatus included in an adjacent vehicle or a traffic management device, when it is determined that the accident has occurred, determine an accident level based on the state information of the vehicle, and control the second communicator to transmit, to an external server, one or more information items of the passenger information received from the passenger terminal device included in the vehicle based on the determined accident level, wherein the transmitted one or more information items comprising: emergency contact and human information among the received passenger information when the accident level is a first level; emergency contact, blood information, and medical history information among the received passenger information when the accident level is a second level; and all the received passenger information when the accident level is a third level. emergency contact and human information among the received passenger information when the accident level is a first level; emergency contact, blood information, and medical history information among the received passenger information when the accident level is a second level; and all the received passenger information when the accident level is a third level.