An aspect of the present invention discloses a 5G-based network performance diagnosis method in a network performance diagnosis apparatus connected to a switching device connected to a 5G-based network. The method comprises the steps of obtaining at least one mirrored packets for at least one packet transmitted and received from a user terminal connected to at least one base station based on mirroring from the switching device, the mirrored at least Calculating a performance-related index representing the performance of the user terminal and the network associated with the at least one base station based on at least some of the information included in one packet, and the 5G-based network based on the performance-related index. It includes the step of determining whether or not normal operation.
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