obtaining flow data files of the mobile terminal at two or more points of time after the mobile terminal connects to a network using a same first type of network access means, wherein: each flow data file contains data about multiple flow identifiers and multiple flow volumes associated with the multiple flow identifiers, a flow identifier indicating a type of network access means, a flow volume indicating data flow generated by the mobile terminal using the network access means indicated by the associated flow identifier;

obtaining the first type of network access means used by the mobile terminal to connect to the network;

from the obtained flow data files, comparing flow volumes in the flow data files having a same flow identifier to determine a flow identifier in the flow data file with changing flow volumes, including:

identifying a candidate flow identifier that exists in both a first flow data file and in a second flow data file;

comparing a first flow volume associated with the candidate flow identifier recorded in the first flow data file and a second flow volume associated with the same candidate flow identifier recorded in the second flow data file; and

determining that the candidate flow identifier is the flow identifier with changing flow volumes if the first flow volume is not equal to the second flow volume; and

identifying that the determined flow identifier in the flow data files with changing flow volumes, among the multiple flow identifiers, has a one-to-one correspondence relationship with the first type of network access means used by the mobile terminal to connect to the network,

wherein the method comprises:

uploading to a server, by the mobile terminal, the flow data files obtained at two or more points of time and the first type of network access means, together with a terminal model information of the mobile terminal, wherein the server identifies the one-to-one correspondence relationship according to the terminal model information.