A system for analyzing a diffusion trend of a diffusible substance, comprising: an obtaining module configured to obtain, via a network satisfying a time delay condition, wherein the network satisfying the time delay condition includes a time delay of the network is less than a delay threshold, the delay threshold including one of 1 millisecond, 0.5 milliseconds, 0.2 milliseconds, 0.1 milliseconds, a plurality of sets of reference information relating to the diffusible substance from a plurality of devices respectively, each of the plurality of sets of reference information at least including a time point when a corresponding device detects the diffusible substance and a location where the device detects the diffusible substance, wherein the plurality of sets of reference information correspond to a same time domain through the plurality of devices connecting to a server via a 5G network; and a diffusion trend determination module configured to: rank the plurality of sets of reference information based on a plurality of time points corresponding to the plurality of sets of reference information; and determine the diffusion trend of the diffusible substance based on a ranking result, wherein each of the plurality of sets of reference information includes sound information relating to the diffusible substance at the time point when the diffusible substance is detected by the corresponding device and the location where the diffusible substance is detected by the corresponding device. an obtaining module configured to obtain, via a network satisfying a time delay condition, wherein the network satisfying the time delay condition includes a time delay of the network is less than a delay threshold, the delay threshold including one of 1 millisecond, 0.5 milliseconds, 0.2 milliseconds, 0.1 milliseconds, a plurality of sets of reference information relating to the diffusible substance from a plurality of devices respectively, each of the plurality of sets of reference information at least including a time point when a corresponding device detects the diffusible substance and a location where the device detects the diffusible substance, wherein the plurality of sets of reference information correspond to a same time domain through the plurality of devices connecting to a server via a 5G network; and a diffusion trend determination module configured to: rank the plurality of sets of reference information based on a plurality of time points corresponding to the plurality of sets of reference information; and determine the diffusion trend of the diffusible substance based on a ranking result, wherein each of the plurality of sets of reference information includes sound information relating to the diffusible substance at the time point when the diffusible substance is detected by the corresponding device and the location where the diffusible substance is detected by the corresponding device. rank the plurality of sets of reference information based on a plurality of time points corresponding to the plurality of sets of reference information; and determine the diffusion trend of the diffusible substance based on a ranking result, wherein each of the plurality of sets of reference information includes sound information relating to the diffusible substance at the time point when the diffusible substance is detected by the corresponding device and the location where the diffusible substance is detected by the corresponding device. <EOS>