PROGRAM DOWNLOADING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a program downloading method by which a plurality of subscriber circuits can download program data in one operation at a low cost. SOLUTION: In the program downloading method in an exchange system having a plurality of subscriber circuits 103 tat can store downloaded programs and a download section 122 with a 1st download path 152 and a 2nd download path 151, the 1st download path 152 is used to control downloading and transfer of program data, and the 2nd download path 151 is used to transfer the program data when the data transfer capability of the 1st download path 152 is deficient. A network may be automatically selected or designated.