An apparatus and method of switching a channel under wireless network circumstances is provided, which can secure network resources by performing channel switching and channel bonding with an adjacent network if the network resources of the currently participating network are insufficient in performing wireless data communications. The apparatus includes a message analysis unit analyzing at least one received channel information message and confirming whether a channel corresponding to the channel information message and a channel adjacent to the channel are usable, a channel switching unit performing a channel switching with a usable target channel among the channels with reference to whether the confirmed channel and the adjacent channels are usable, in accordance with a result of determining whether network resources of a currently used channel are insufficient, and a channel bonding unit performing a channel bonding between the channel-switched target channel and the adjacent channels.