Embodiments of the disclosure provide a network connected device and a traffic estimation method of the network connected device. In the method, a plurality of network packets are captured, a quantity of query times for at least one domain name in the network packets is counted, and network traffic of each network layer or each service type is determined according to the quantity of query times. In addition, according to the embodiments of the disclosure, a corresponding type feature is generated for a user based on a domain name query record. In this way, the Internet experience of the user may be improved based on the estimated result.