Patent ID: 7539106

Claim:
A data processing device capable of copying data between a plurality of recording media and comprising an arithmetic processor for adding up the amounts of data on a plurality of files recorded on a transmitting medium to thereby detect the total amount of copy data, a display unit for displaying the total amount of copy data detected, and a display controller for displaying an intermediate result of addition on the display unit while updating the result displayed during a process from the start of addition of the amounts of file data by the arithmetic processor until the completion of addition and displaying the final result of addition on the display unit upon the completion of addition wherein updating and displaying the intermediate result a copy data total amount is displayed every time the amount of data in one file is added up in an initial stage of a detection procedure and as the detection procedure progresses the display updating process is thinned out as a function of at least one of time, file data amount, or number of files to gradually increase a display updating interval.