A lifesaving support system comprising: an automatic external defibrillator; and a lifesaving support apparatus adapted to be separately provided from and operably connectable to the automatic external defibrillator, wherein the lifesaving support apparatus includes: a sensor section adapted to be attachable to a patient, and is configured to acquire information of blood flow of the patient; a determining section, based on the information of blood flow, is configured to determine whether or not a use of the automatic external defibrillator is necessary; and an outputting section, in operable communication with the determining section, configured to notify a rescuer of information related to whether or not the use of the automatic external defibrillator is necessary, which is determined by the determining section, wherein when the sensor section detects that a pulse is absent, the determining section is configured to determine that the use of the automatic external defibrillator is necessary and the outputting section is configured to notify the rescuer that the use of the automatic external defibrillator is necessary, wherein the sensor section comprises means for attaching the sensor to one of the forehead, fingertip, the neck, arm or leg of the patient such that it is not necessary to undress the patient, the lifesaving support system further comprises: a box which is configured to house the automatic external defibrillator and the lifesaving support apparatus, wherein the lifesaving support apparatus further includes: a carrying-out detecting section which is configured to detect that the lifesaving support apparatus is carried out from the box; and a controlling section which, when the carrying-out detecting section detects that the lifesaving support apparatus is carried out from the box, is configured to execute an activating process of the lifesaving support apparatus. an automatic external defibrillator; and a lifesaving support apparatus adapted to be separately provided from and operably connectable to the automatic external defibrillator, wherein the lifesaving support apparatus includes: a sensor section adapted to be attachable to a patient, and is configured to acquire information of blood flow of the patient; a determining section, based on the information of blood flow, is configured to determine whether or not a use of the automatic external defibrillator is necessary; and an outputting section, in operable communication with the determining section, configured to notify a rescuer of information related to whether or not the use of the automatic external defibrillator is necessary, which is determined by the determining section, wherein a sensor section adapted to be attachable to a patient, and is configured to acquire information of blood flow of the patient; a determining section, based on the information of blood flow, is configured to determine whether or not a use of the automatic external defibrillator is necessary; and an outputting section, in operable communication with the determining section, configured to notify a rescuer of information related to whether or not the use of the automatic external defibrillator is necessary, which is determined by the determining section, wherein when the sensor section detects that a pulse is absent, the determining section is configured to determine that the use of the automatic external defibrillator is necessary and the outputting section is configured to notify the rescuer that the use of the automatic external defibrillator is necessary, wherein the sensor section comprises means for attaching the sensor to one of the forehead, fingertip, the neck, arm or leg of the patient such that it is not necessary to undress the patient, the lifesaving support system further comprises: a box which is configured to house the automatic external defibrillator and the lifesaving support apparatus, wherein the lifesaving support apparatus further includes: a carrying-out detecting section which is configured to detect that the lifesaving support apparatus is carried out from the box; and a controlling section which, when the carrying-out detecting section detects that the lifesaving support apparatus is carried out from the box, is configured to execute an activating process of the lifesaving support apparatus. a box which is configured to house the automatic external defibrillator and the lifesaving support apparatus, wherein the lifesaving support apparatus further includes: a carrying-out detecting section which is configured to detect that the lifesaving support apparatus is carried out from the box; and a controlling section which, when the carrying-out detecting section detects that the lifesaving support apparatus is carried out from the box, is configured to execute an activating process of the lifesaving support apparatus. a carrying-out detecting section which is configured to detect that the lifesaving support apparatus is carried out from the box; and a controlling section which, when the carrying-out detecting section detects that the lifesaving support apparatus is carried out from the box, is configured to execute an activating process of the lifesaving support apparatus.