A management device for controlling a traffic transmission between a terminal and a data network in a wireless communication system, the management device comprising: a network slice manager configured to configure a plurality of network slices for a terminal , wherein each of the plurality of network slices is configured for a different frequency band, and wherein a base station is allocated to each of the plurality of network slices; a policy manager configured to set a policy applied to the plurality of network slices, wherein the policy includes transmission path information of traffic for each of the plurality of network slices and information on a service level agreement, SLA, applied to each of the plurality of network slices; and a software defined network, SDN, device configured to identify a base station based on an internet protocol, IP, address which is included in the traffic, select a network slice for which the identified base station is allocated from the plurality of network slices, and control one or more network entities for transmitting the traffic through a transmission path, based on the transmission path information corresponding to the selected network slice, wherein the network slice manager is further configured to transmit, to a server including a user plane function, UPF, a signal to request monitoring network quality for at least one network slice, obtain, from the server, first measurement information on the traffic and second measurement information on a test packet, and determine whether quality information for the at least one network slice satisfies the information on the SLA agreement based on the first measurement information and the second measurement information, and wherein the test packet transmitted and received between the terminal and the UPF provides the server with the second measurement information. a network slice manager configured to configure a plurality of network slices for a terminal , wherein each of the plurality of network slices is configured for a different frequency band, and wherein a base station is allocated to each of the plurality of network slices; a policy manager configured to set a policy applied to the plurality of network slices, wherein the policy includes transmission path information of traffic for each of the plurality of network slices and information on a service level agreement, SLA, applied to each of the plurality of network slices; and a software defined network, SDN, device configured to identify a base station based on an internet protocol, IP, address which is included in the traffic, select a network slice for which the identified base station is allocated from the plurality of network slices, and control one or more network entities for transmitting the traffic through a transmission path, based on the transmission path information corresponding to the selected network slice, wherein the network slice manager is further configured to transmit, to a server including a user plane function, UPF, a signal to request monitoring network quality for at least one network slice, obtain, from the server, first measurement information on the traffic and second measurement information on a test packet, and determine whether quality information for the at least one network slice satisfies the information on the SLA agreement based on the first measurement information and the second measurement information, and wherein the test packet transmitted and received between the terminal and the UPF provides the server with the second measurement information. <EOS>