To reduce the burden on a correcting operator and to prevent a correction miss, etc., by converting arbitrary specific information which is stored into information having corrected contents at a time when the specific information is modified.

A business office 1 is connected to a center 3 through a communication line, e.g. a public network 2. An actual result master file storage part 6 connected to a file server 12 in the center 3 is stored with an actual result master file 7 consisting of data of combinations of recipients and requesters who actually used this system. An information modification process part 8 is provided so as to convert part of this actual result master file 7 altogether when, for example, a bank name or branch name is changed. The contents of the actual result master file 7 can be modified altogether by operating this information modification process part 8. Consequently, a character recognition and conversion process for a document on which the bank name after the change is used becomes possible by using the past actual use results.