A data processing method, applied to a mobile terminal (400, 600, 700), comprising: receiving indication information sent by a network side for indicating whether the mobile terminal (400, 600, 700) duplicates buffer data in a Packet Data Convergence Protocol, PDCP, layer; and performing predetermined processing on the buffer data in the PDCP layer if the indication information indicates duplicating the buffer data in the PDCP layer, the data processing method is characterized by the performing predetermined processing on the buffer data in the PDCP layer if the indication information indicates duplicating the buffer data in the PDCP layer comprises: calculating a first data amount corresponding to a first type transmission path and a second data amount corresponding to a second type transmission path if the indication information indicates duplicating the buffer data in the PDCP layer, the first type transmission path being at least one transmission path configured by the network side or predetermined based on a protocol among all transmission paths corresponding to the PDCP layer, the second type transmission path being transmission paths among all transmission paths corresponding to the PDCP layer other than the first type transmission path, the first data amount being a sum of a data amount of the duplication data obtained by duplication processing in the PDCP layer and a data amount of data without being duplicated in the PDCP layer, and the second data amount being the data amount of the duplication data; sending the first data amount to a first Media Access Control, MAC, entity corresponding to the first type transmission path, and sending the second data amount to a second MAC entity corresponding to the second type transmission path; and reporting the first data amount to the network side through the first MAC entity, and reporting the second data amount to the network side through the second MAC entity. receiving indication information sent by a network side for indicating whether the mobile terminal (400, 600, 700) duplicates buffer data in a Packet Data Convergence Protocol, PDCP, layer; and performing predetermined processing on the buffer data in the PDCP layer if the indication information indicates duplicating the buffer data in the PDCP layer, the data processing method is characterized by the performing predetermined processing on the buffer data in the PDCP layer if the indication information indicates duplicating the buffer data in the PDCP layer comprises: calculating a first data amount corresponding to a first type transmission path and a second data amount corresponding to a second type transmission path if the indication information indicates duplicating the buffer data in the PDCP layer, the first type transmission path being at least one transmission path configured by the network side or predetermined based on a protocol among all transmission paths corresponding to the PDCP layer, the second type transmission path being transmission paths among all transmission paths corresponding to the PDCP layer other than the first type transmission path, the first data amount being a sum of a data amount of the duplication data obtained by duplication processing in the PDCP layer and a data amount of data without being duplicated in the PDCP layer, and the second data amount being the data amount of the duplication data; sending the first data amount to a first Media Access Control, MAC, entity corresponding to the first type transmission path, and sending the second data amount to a second MAC entity corresponding to the second type transmission path; and reporting the first data amount to the network side through the first MAC entity, and reporting the second data amount to the network side through the second MAC entity. calculating a first data amount corresponding to a first type transmission path and a second data amount corresponding to a second type transmission path if the indication information indicates duplicating the buffer data in the PDCP layer, the first type transmission path being at least one transmission path configured by the network side or predetermined based on a protocol among all transmission paths corresponding to the PDCP layer, the second type transmission path being transmission paths among all transmission paths corresponding to the PDCP layer other than the first type transmission path, the first data amount being a sum of a data amount of the duplication data obtained by duplication processing in the PDCP layer and a data amount of data without being duplicated in the PDCP layer, and the second data amount being the data amount of the duplication data; sending the first data amount to a first Media Access Control, MAC, entity corresponding to the first type transmission path, and sending the second data amount to a second MAC entity corresponding to the second type transmission path; and reporting the first data amount to the network side through the first MAC entity, and reporting the second data amount to the network side through the second MAC entity.