An in-train monitor system comprising: an information management system (80, 100, 110, 120) that is adapted to manage monitoring-target condition information output from sensors included respectively in various condition monitoring target devices incorporated in a train, said monitoring-target condition information being for monitoring an abnormal condition of the devices incorporated in the train; cameras that are incorporated in respective train cars and which are adapted to take images of the devices incorporated in the train; and a transmission device that is connected to an in-train transmission channel of each train car and adapted to relay imaging data from the camera to each train car, wherein the in-train monitor system further comprises: a camera-control central device that includes a correspondence relation between the devices incorporated in the train and the cameras that take images of the devices, and is connected to the information management system (80, 100, 110, 120) and the transmission device, which is adapted to monitor the monitoring-target condition information sent from the information management system (80, 100, 110, 120), and adapted to determine whether the devices incorporated in the train are in a normal condition based on the monitoring-target condition information, and further adapted to generate a frame-rate control signal for adjusting a frame rate of imaging data from each camera; and a camera-control terminal device that is connected to the transmission device and at least one of the camera and adapted to adjust the frame rate of imaging data from each camera based on the frame-rate control signal; wherein the camera-control terminal device is adapted to adjust the frame rate of imaging data from each camera based on the correspondence relation. an information management system (80, 100, 110, 120) that is adapted to manage monitoring-target condition information output from sensors included respectively in various condition monitoring target devices incorporated in a train, said monitoring-target condition information being for monitoring an abnormal condition of the devices incorporated in the train; cameras that are incorporated in respective train cars and which are adapted to take images of the devices incorporated in the train; and a transmission device that is connected to an in-train transmission channel of each train car and adapted to relay imaging data from the camera to each train car, wherein the in-train monitor system further comprises: a camera-control central device that includes a correspondence relation between the devices incorporated in the train and the cameras that take images of the devices, and is connected to the information management system (80, 100, 110, 120) and the transmission device, which is adapted to monitor the monitoring-target condition information sent from the information management system (80, 100, 110, 120), and adapted to determine whether the devices incorporated in the train are in a normal condition based on the monitoring-target condition information, and further adapted to generate a frame-rate control signal for adjusting a frame rate of imaging data from each camera; and a camera-control terminal device that is connected to the transmission device and at least one of the camera and adapted to adjust the frame rate of imaging data from each camera based on the frame-rate control signal; wherein the camera-control terminal device is adapted to adjust the frame rate of imaging data from each camera based on the correspondence relation. a camera-control central device that includes a correspondence relation between the devices incorporated in the train and the cameras that take images of the devices, and is connected to the information management system (80, 100, 110, 120) and the transmission device, which is adapted to monitor the monitoring-target condition information sent from the information management system (80, 100, 110, 120), and adapted to determine whether the devices incorporated in the train are in a normal condition based on the monitoring-target condition information, and further adapted to generate a frame-rate control signal for adjusting a frame rate of imaging data from each camera; and a camera-control terminal device that is connected to the transmission device and at least one of the camera and adapted to adjust the frame rate of imaging data from each camera based on the frame-rate control signal; wherein the camera-control terminal device is adapted to adjust the frame rate of imaging data from each camera based on the correspondence relation.