A multiple viewpoint image capturing system, comprising: a plurality of image capturing devices (10A-10N) configured to capture videos in a predetermined space from different positions, each image capturing device including a camera and a motion sensor (105; 125) for detecting a motion of the camera; and a control device communicatively coupled to each of the plurality of image capturing devices (10A-10N), said control device being configured to receive motion information from each of the plurality of image capturing devices (10A-10N), said motion information indicating at least one of a change in position and attitude detected by the respective motion sensor (105; 125), to detect, based on the received motion information, occurrence of a predetermined event that has a possibility of being a reason for calibrating at least one of the cameras included in the plurality of image capturing devices (10A-10N), to determine whether to perform camera calibration in a case of detecting the occurrence of the predetermined event, and to output camera calibration information that indicates the at least one camera of the plurality of image capturing devices (10A-10N) on which camera calibration is to be performed in a case of determining that the camera calibration is to be performed, characterized in that the control device is further configured to detect the occurrence of the predetermined event in a case where the motion information indicates a change that exceeds a first threshold value and to determine that camera calibration is to be performed in a case where the motion information indicates a change that exceeds a second threshold value larger than the first threshold value; the control device is further configured, in a case where the motion information indicates a change that exceeds a third threshold value larger than the second threshold value, to output camera adjustment information indicating an adjustment of a capturing area, wherein said adjustment is to be performed on at least some of the plurality of cameras. a plurality of image capturing devices (10A-10N) configured to capture videos in a predetermined space from different positions, each image capturing device including a camera and a motion sensor (105; 125) for detecting a motion of the camera; and a control device communicatively coupled to each of the plurality of image capturing devices (10A-10N), said control device being configured to receive motion information from each of the plurality of image capturing devices (10A-10N), said motion information indicating at least one of a change in position and attitude detected by the respective motion sensor (105; 125), to detect, based on the received motion information, occurrence of a predetermined event that has a possibility of being a reason for calibrating at least one of the cameras included in the plurality of image capturing devices (10A-10N), to determine whether to perform camera calibration in a case of detecting the occurrence of the predetermined event, and to output camera calibration information that indicates the at least one camera of the plurality of image capturing devices (10A-10N) on which camera calibration is to be performed in a case of determining that the camera calibration is to be performed, characterized in that the control device is further configured to detect the occurrence of the predetermined event in a case where the motion information indicates a change that exceeds a first threshold value and to determine that camera calibration is to be performed in a case where the motion information indicates a change that exceeds a second threshold value larger than the first threshold value; the control device is further configured, in a case where the motion information indicates a change that exceeds a third threshold value larger than the second threshold value, to output camera adjustment information indicating an adjustment of a capturing area, wherein said adjustment is to be performed on at least some of the plurality of cameras.