Embodiments of this application disclose a data processing method and an apparatus thereof. The method includes the following steps: processing, by a network device, to-be-transmitted data to obtain a data distribution manner, where the processing includes at least one of interleaving processing and mapping processing that is performed in a mapping sequence; the data distribution manner is used to indicate distribution of data from a same code block; and when the processing includes only mapping processing performed in a mapping sequence, the mapping sequence does not include a mapping sequence in which space-domain mapping is first performed, frequency-domain mapping is then performed, and time-domain mapping is finally performed; sending, by the network device, the to-be-transmitted data distributed in the data distribution manner; receiving, by a terminal device, processed to-be-transmitted data; and determining, by the terminal device, a data distribution manner, and performing de-processing on the processed to-be-transmitted data in the data distribution manner, to obtain the to-be-transmitted data. The embodiments of this application are applicable to a system having a plurality of application scenarios, and a data distribution manner in which data is centrally distributed and a data distribution manner in which data is de-centrally distributed can be achieved.