Network testing system and operating method thereof

An operating method of a network testing system, comprising:

• performing time synchronization based on time data and generating first timing information by a first network testing apparatus at the time of transmitting a standard wave including the timing data from a radio wave transmitting apparatus;
• transmitting the first timing information and a network test request to a second network testing apparatus;
• determining whether the time synchronization of the second network testing apparatus is performed, based on at least one of a network test reply and second timing information, at the time of receiving the network test reply and the second timing information corresponding to the network test request and the first timing information from the second network testing apparatus;
• and
• as the determination result, when the timing synchronization of the second network testing apparatus is completed, performing the network testing along with the second network testing apparatus.