An embodiment of the invention provides a people flow volume statistical method, apparatus and system. The method includes the steps of acquiring and storing terminal characteristic data sent by an access point (AP) device through a server device, wherein the terminal characteristic data comprises a terminal identifier, a signal strength identifier, time information and position information corresponding to the time information; integrating the terminal characteristic data in accordance with the time information through a multiple point-in-time intersection algorithm, and storing a processing result in a terminal information table corresponding to the AP device. The existing bus-mounted AP device is used for collecting a terminal signal in order to estimate the people flow volume on roads where buses pass by and the number of passengers on the buses, and meanwhile, locations and movement states of terminals can be analyzed on the basis of the terminals and the signal strength of the terminals, which are acquired through different AP devices at different times in different locations, so that the people flow volume statistic can be achieved for providing objective data reference indexes for operators.