A processing method includes: performing a target operation when data transmission on a target transmission path in the M transmission paths fails, where the target operation includes at least one of: reporting failure indication information; performing a first operation on a target radio link control (RLC) entity corresponding to the target transmission path; performing a second operation on a target medium access control (MAC) entity corresponding to the target transmission path; performing a third operation on a target SCell corresponding to the target transmission path; or performing a fourth operation on the target split bearer.