A terminal obtains at least one piece of data, in which each piece of data in the at least one piece of data belongs to a different modality; obtains acquisition time information corresponding to each piece of data; and sends the at least one piece of data and at least one acquisition time information to a centralized processing unit. The centralized processing unit receives at least one piece of data and at least one piece of acquisition time information from at least one terminal, determines data corresponding to each acquisition time information in the at least one acquisition time information from the at least one piece of data, and processes the data corresponding to each acquisition time information.