system includes a log management computer 101 log generating systems 105 an administrator terminal 103 client terminals 104 and a log collecting system 106 the log management computer 101 has storage devices 102 the log generating systems 105 are coupled to the log management computer 101 via a network 107 and the log collecting system 106 the administrator terminal 103 is coupled to the log management computer 101 via a network 108 the administrator terminal 103 may instead be connected directly to the log management computer 101 the client terminals 104 are coupled to the log management computer 101 via a network 109 the client terminals 104 may instead be connected directly to the log management computer 101 the log management computer 101 is coupled to the storage devices 102 via a network 110 the log management computer 101 may instead be connected directly to the storage devices 102 the networks 107 to 110 can be dedicated lines wide area networks such as the internet and local networks such as a local area network lan at least one pair out of the networks 107 to 110 may be the same network the log generating systems 105 are systems that generate an operation record as a log each log generating system 105 may generate its own operation record as a log or may generate an operation record of another apparatus as a log the log generating systems 105 include.