A method of accessing a WI-FI network, comprising: receiving a free-certification access request broadcast from a first terminal, and determining whether the first terminal meets a free-certification condition according to a terminal identification carried in the free-certification access request; sending a connection invitation response to the first terminal if the first terminal meets the free-certification condition; receiving a connection request sent from the first terminal according to the connection invitation response, and enabling the first terminal to access a wireless fidelity WI-FI network according to the connection request; setting a second terminal to possess a confirmation permission to a free-certification access of the first terminal before the receiving the free-certification access request sent from the first terminal, and wherein; the step of determining whether the first terminal meets the free-certification condition according to the terminal identification carried in the free-certification access request comprises: receiving a confirmation request for the free-certification access sent from the second terminal; returning a terminal list to be confirmed including a terminal identification of the first terminal to the second terminal; receiving a confirmation information sent from the second terminal, the confirmation information carrying a terminal identification selected by the second terminal; and confirming that the first terminal meets the free-certification condition, if the terminal identification selected by the second terminal carried in the confirmation information is the same as the terminal identification carried in the free-certification access request. receiving a free-certification access request broadcast from a first terminal, and determining whether the first terminal meets a free-certification condition according to a terminal identification carried in the free-certification access request; sending a connection invitation response to the first terminal if the first terminal meets the free-certification condition; receiving a connection request sent from the first terminal according to the connection invitation response, and enabling the first terminal to access a wireless fidelity WI-FI network according to the connection request; setting a second terminal to possess a confirmation permission to a free-certification access of the first terminal before the receiving the free-certification access request sent from the first terminal, and wherein; the step of determining whether the first terminal meets the free-certification condition according to the terminal identification carried in the free-certification access request comprises: receiving a confirmation request for the free-certification access sent from the second terminal; returning a terminal list to be confirmed including a terminal identification of the first terminal to the second terminal; receiving a confirmation information sent from the second terminal, the confirmation information carrying a terminal identification selected by the second terminal; and confirming that the first terminal meets the free-certification condition, if the terminal identification selected by the second terminal carried in the confirmation information is the same as the terminal identification carried in the free-certification access request. receiving a confirmation request for the free-certification access sent from the second terminal; returning a terminal list to be confirmed including a terminal identification of the first terminal to the second terminal; receiving a confirmation information sent from the second terminal, the confirmation information carrying a terminal identification selected by the second terminal; and confirming that the first terminal meets the free-certification condition, if the terminal identification selected by the second terminal carried in the confirmation information is the same as the terminal identification carried in the free-certification access request.