An access point configured to communicate with at least one wireless terminal through a Wireless Local Area Network, WLAN, wherein the access point comprises: an access-point WLAN communicator configured to use a predetermined available channel of a first frequency band to communicate with the at least one wireless terminal; a time difference calculator configured to calculate time difference information of the access point, the time difference information including a time difference between a current time and a time when a next beacon is transmitted from the access point in the available channel; a pointer signal generator configured to generate a pointer signal including available-channel information of the access point for the available channel of the first frequency band, a network identifier of the access point in the first frequency band, and the time difference information of the access point; and an access-point pointer signal communicator configured to use a specific channel of a second frequency band to send the pointer signal to the at least one wireless terminal, wherein sending of the pointer signal to the at least one wireless terminal, the pointer signal including the time difference information of the access point in addition to the available channel information of the access point and the network identifier of the access point, enables the at least one wireless terminal to await sensing of the beacon transmitted from the access point in the available channel at a timing when the time difference elapses after receiving the pointer signal including the available-channel information of the access point, the network identifier of the access point and the time difference information of the access point. an access-point WLAN communicator configured to use a predetermined available channel of a first frequency band to communicate with the at least one wireless terminal; a time difference calculator configured to calculate time difference information of the access point, the time difference information including a time difference between a current time and a time when a next beacon is transmitted from the access point in the available channel; a pointer signal generator configured to generate a pointer signal including available-channel information of the access point for the available channel of the first frequency band, a network identifier of the access point in the first frequency band, and the time difference information of the access point; and an access-point pointer signal communicator configured to use a specific channel of a second frequency band to send the pointer signal to the at least one wireless terminal, wherein sending of the pointer signal to the at least one wireless terminal, the pointer signal including the time difference information of the access point in addition to the available channel information of the access point and the network identifier of the access point, enables the at least one wireless terminal to await sensing of the beacon transmitted from the access point in the available channel at a timing when the time difference elapses after receiving the pointer signal including the available-channel information of the access point, the network identifier of the access point and the time difference information of the access point.