A first network device, comprising: a first transceiving module, configured to: first scan a signal on a first spectrum when needing to use the first spectrum, and, if a signal strength or energy of the scanned signal is less than a preset threshold, send control information to a target terminal, wherein the control information is used for instructing the target terminal to measure the first spectrum, and the first spectrum is an unlicensed spectrum for the first network device; and receive feedback information reported by the target terminal, wherein the feedback information is obtained by the target terminal by measuring the first spectrum; and a first processing module, configured to determine, according to the feedback information received by the first transceiving module, whether the first spectrum is available; wherein: the control information comprises configuration information and activation information, the configuration information comprises measurement configuration information required by the target terminal for measuring the first spectrum, and the activation information is used for instructing the target terminal to perform measurement according to the configuration information; and the first transceiving module is specifically configured to: after sending the configuration information to the target terminal, send the activation information to the target terminal when the target terminal is required to measure the first spectrum; or the control information comprises the configuration information; and the first transceiving module is specifically configured to send the configuration information to the target terminal when the target terminal is required to measure the first spectrum, so as to instruct the target terminal to perform measurement according to the configuration information; wherein the feedback information comprises: a first measurement result obtained by the target terminal by measuring the first spectrum, wherein the first measurement result comprises received signal strength information. a first transceiving module, configured to: first scan a signal on a first spectrum when needing to use the first spectrum, and, if a signal strength or energy of the scanned signal is less than a preset threshold, send control information to a target terminal, wherein the control information is used for instructing the target terminal to measure the first spectrum, and the first spectrum is an unlicensed spectrum for the first network device; and receive feedback information reported by the target terminal, wherein the feedback information is obtained by the target terminal by measuring the first spectrum; and a first processing module, configured to determine, according to the feedback information received by the first transceiving module, whether the first spectrum is available; wherein: the control information comprises configuration information and activation information, the configuration information comprises measurement configuration information required by the target terminal for measuring the first spectrum, and the activation information is used for instructing the target terminal to perform measurement according to the configuration information; and the first transceiving module is specifically configured to: after sending the configuration information to the target terminal, send the activation information to the target terminal when the target terminal is required to measure the first spectrum; or the control information comprises the configuration information; and the first transceiving module is specifically configured to send the configuration information to the target terminal when the target terminal is required to measure the first spectrum, so as to instruct the target terminal to perform measurement according to the configuration information; wherein the feedback information comprises: a first measurement result obtained by the target terminal by measuring the first spectrum, wherein the first measurement result comprises received signal strength information.