A method for active scanning of a station, STA, the method comprising: transmitting, by the STA, to an access point, AP, a probe request frame including channel monitoring type information in a scanning channel; and determining, by the STA, a time for monitoring a probe response frame transmitted by the AP in the scanning channel based on whether a physical layer convergence procedure protocol data unit, PPDU, is received in the scanning channel until the MinimumChannelTime and the channel monitoring type information, when the scanning channel is in a busy state, wherein the channel monitoring type information includes information related to a type of the STA to monitor the probe response frame in the scanning channel, wherein the PPDU includes a valid physical layer convergence procedure, PLCP header, and if the STA does not receive the probe response frame due to a problem such as collision: wherein the time for monitoring the probe response frame is determined as the MinimumChannelTime when the PPDU is not received in the scanning channel until the MinimumChannelTime and the channel monitoring type information indicates a first type, and wherein the time for monitoring the probe response frame is determined as a MaxChannelTime when the PPDU is not received in the scanning channel until the MinimumChannelTime and the channel monitoring type information indicates a second type. transmitting, by the STA, to an access point, AP, a probe request frame including channel monitoring type information in a scanning channel; and determining, by the STA, a time for monitoring a probe response frame transmitted by the AP in the scanning channel based on whether a physical layer convergence procedure protocol data unit, PPDU, is received in the scanning channel until the MinimumChannelTime and the channel monitoring type information, when the scanning channel is in a busy state, wherein the channel monitoring type information includes information related to a type of the STA to monitor the probe response frame in the scanning channel, wherein the PPDU includes a valid physical layer convergence procedure, PLCP header, and if the STA does not receive the probe response frame due to a problem such as collision: wherein the time for monitoring the probe response frame is determined as the MinimumChannelTime when the PPDU is not received in the scanning channel until the MinimumChannelTime and the channel monitoring type information indicates a first type, and wherein the time for monitoring the probe response frame is determined as a MaxChannelTime when the PPDU is not received in the scanning channel until the MinimumChannelTime and the channel monitoring type information indicates a second type. wherein the time for monitoring the probe response frame is determined as the MinimumChannelTime when the PPDU is not received in the scanning channel until the MinimumChannelTime and the channel monitoring type information indicates a first type, and wherein the time for monitoring the probe response frame is determined as a MaxChannelTime when the PPDU is not received in the scanning channel until the MinimumChannelTime and the channel monitoring type information indicates a second type.