1. A wireless network device comprising: a memory configured to store routing latency information for routing from the wireless network device to other nodes in a network; a processor configured to determine transmission latency requirement of transmitting data packets from the wireless network device to a destination node according to transmission latency requirement information carried in the data packets after obtaining the data packets to be transmitted, query available routes from the wireless network device to the destination node, and the stored latency information corresponding to the available routes, select a route most approximate to the determined transmission latency requirement from the available routes according to a query result of the query module, and transmit the data packets.