To conform an updating process for a file group on a slave server side to that of a master server by updating files on the other information processor according to an updating process kind based upon logging data.

Log data based upon the update of a data base 14 on the master server 1 are stacked at a log stacking process part 11 and adjusted at a log editing process part 12 as to repeated or duplicate update data, etc., and then the data are sent from a communication part 13 and received by a communication part 23 of the slave server 2; and a data base update part 21 updates the data base S24 according to the log data. At this time, a file which is already updated is obtained by accessing the data base M14 on the master server as to some file whose update is specified with the log data to update the data base S24 on the slave server 2, and a file whose deletion is specified is processed directly in the data base S24 on the slave server 2.