a method includes creating process data which constitutes at least a portion of the control program and describes the execution contents of the communication functions , and parameter data which constitutes a different portion of the control program from the process data portion and is used to describe individual setting information of user in accordance with the process data , in the center apparatus , sending the process data , and the parameter data from the center apparatus to the user apparatus via the communication network , receiving the process data and the parameter data from the center apparatus , then describing input individual setting information in the parameter data to create the control program , in the user apparatus , recording the resulting control program onto a recording medium , and reading the control program from the recording medium and setting the read control program in the communication equipment as requested by the user , in the user apparatus .