The present invention relates to a message analyzing method capable of performing an input / output function of an operator by using an operating terminal computer (PC) of an electronic exchanger and simultaneously tracking the contents of a message transmitted / received between related application programs or application programs.;The method includes a first step (1, 2) of confirming whether an input command is received in an application program and the received data requires a message analysis, and a second step (1, A second step (4 to 7, 13) for checking whether a debugging window of the debugging window is open and opening an debugging window and processing an input command if the debugging window is not open and performing an input command processing without opening another window if the debugging window is open; After the execution of the message analysis, if the message analysis is not requested, it is checked whether the debugging window is opened. If the message analysis is not opened, the third step (9-13) of executing the command processing after the debugging window is closed and the command processing if not opened And the like.
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