A server comprising: a recording unit; and a controller configured to receive image data of a subject from a camera, control the recording unit to record the image data of the subject that is received from the camera, and to analyze the image data in the recording unit; monitor the image data of the subject to determine whether a reception state of the image data of the subject that is received from the camera is abnormal wherein the controller is configured to determine that the reception state of the image data is abnormal when the image data of the subject is not received within a predetermined period of time, and responsive to determining that the reception state of the image data of the subject that is received from the camera is abnormal, control the recording unit to perform recording end processing on the image data of the subject that has already been recorded on a basis of a result of analysis obtained before determining that the reception state of the image data of the subject that is received from the camera is abnormal, the recording end processing terminating the recording of the image data such that the recorded image data can be reproduced by completing the recorded information in a file format of the image data. a recording unit; and a controller configured to receive image data of a subject from a camera, control the recording unit to record the image data of the subject that is received from the camera, and to analyze the image data in the recording unit; monitor the image data of the subject to determine whether a reception state of the image data of the subject that is received from the camera is abnormal wherein the controller is configured to determine that the reception state of the image data is abnormal when the image data of the subject is not received within a predetermined period of time, and responsive to determining that the reception state of the image data of the subject that is received from the camera is abnormal, control the recording unit to perform recording end processing on the image data of the subject that has already been recorded on a basis of a result of analysis obtained before determining that the reception state of the image data of the subject that is received from the camera is abnormal, the recording end processing terminating the recording of the image data such that the recorded image data can be reproduced by completing the recorded information in a file format of the image data. receive image data of a subject from a camera, control the recording unit to record the image data of the subject that is received from the camera, and to analyze the image data in the recording unit; monitor the image data of the subject to determine whether a reception state of the image data of the subject that is received from the camera is abnormal wherein the controller is configured to determine that the reception state of the image data is abnormal when the image data of the subject is not received within a predetermined period of time, and responsive to determining that the reception state of the image data of the subject that is received from the camera is abnormal, control the recording unit to perform recording end processing on the image data of the subject that has already been recorded on a basis of a result of analysis obtained before determining that the reception state of the image data of the subject that is received from the camera is abnormal, the recording end processing terminating the recording of the image data such that the recorded image data can be reproduced by completing the recorded information in a file format of the image data.