DATA FILE MANAGEMENT METHOD, DATA FILE MANAGEMENT PROGRAM, AND ELECTRONIC TERMINAL UNIT

摘要

PROBLEM TO BE SOLVED: To provide a data file management method permitting file retrieval based on the information related to a condition in the past of a data file and capable of obtaining the information related to file operation for the data file. SOLUTION: When the data file is recorded or read in accordance with file operation (step 31), file operation history Df about the data file is sequentially added and recorded in a management file Th independent from the data file (steps 33, 34).