A system comprising: a terminal device; a plurality of display devices which are each installed in a respective area and which display a target video image; and a management device which controls the display devices, wherein the terminal device includes a camera which obtains image data of a still image or a moving image, and a clocking unit which specifies a capturing time at which the camera has performed the capturing, characterized in that the system further comprises a plurality of ultrasonic wave generating devices that broadcast position information for each area by generating an ultrasonic wave of a predetermined frequency that differs for each area and the terminal device further includes an ultrasonic sensor for specifying a capturing place of the terminal device when detecting the frequency of the ultrasonic wave, a memory or a storage storing data of a timetable format for specifying a display device which displays a target video image, a type of a target displayed by the display device, and a display time of the target video image of the type, and a processor judging whether or not: the capturing place of a certain terminal device belongs to a same area as that of a certain display device; and the capturing time of the certain terminal device matches with a display time of the target video image of the specific type of the certain display device, based on the data of a timetable format, and deciding that the camera has captured the target video image of the specific type if judging that aforementioned are matched without analyzing the image data obtained by the certain terminal device. the terminal device includes a camera which obtains image data of a still image or a moving image, and a clocking unit which specifies a capturing time at which the camera has performed the capturing, a camera which obtains image data of a still image or a moving image, and a clocking unit which specifies a capturing time at which the camera has performed the capturing, characterized in that the system further comprises a plurality of ultrasonic wave generating devices that broadcast position information for each area by generating an ultrasonic wave of a predetermined frequency that differs for each area and the terminal device further includes an ultrasonic sensor for specifying a capturing place of the terminal device when detecting the frequency of the ultrasonic wave, a memory or a storage storing data of a timetable format for specifying a display device which displays a target video image, a type of a target displayed by the display device, and a display time of the target video image of the type, and a processor judging whether or not: the capturing place of a certain terminal device belongs to a same area as that of a certain display device; and the capturing time of the certain terminal device matches with a display time of the target video image of the specific type of the certain display device, based on the data of a timetable format, and deciding that the camera has captured the target video image of the specific type if judging that aforementioned are matched without analyzing the image data obtained by the certain terminal device. an ultrasonic sensor for specifying a capturing place of the terminal device when detecting the frequency of the ultrasonic wave, a memory or a storage storing data of a timetable format for specifying a display device which displays a target video image, a type of a target displayed by the display device, and a display time of the target video image of the type, and a processor judging whether or not: the capturing place of a certain terminal device belongs to a same area as that of a certain display device; and the capturing time of the certain terminal device matches with a display time of the target video image of the specific type of the certain display device, based on the data of a timetable format, and deciding that the camera has captured the target video image of the specific type if judging that aforementioned are matched without analyzing the image data obtained by the certain terminal device.