A method for performing an uplink data operation, the method comprising: determining, by a user equipment, an uplink grant corresponding to a numerology configured by the network side for the user equipment, according to a first correspondence relationship between numerologies and uplink grants; determining, by the user equipment, one or more bearers corresponding to the numerology configured by the network side for the user equipment, according to a second correspondence relationship between the numerologies and bearers; and performing, by the user equipment, an uplink data operation according to the determined uplink grant corresponding to the numerology and the determined bearers corresponding to the numerology; determining, by the user equipment, the first correspondence relationship and/or the second correspondence relationship according to a configuration of a network-side device; wherein the method is characterised by determining, by the user equipment, the first correspondence relationship configured by the network-side device in a part or all of the following implementations: determining, by the user equipment, the first correspondence relationship according to network slice identifiers corresponding to the uplink grants configured by the network-side device, or network slice identifiers corresponding to the uplink data transmission resources corresponding to the uplink grants, and a fourth correspondence relationship between numerologies and the network slice identifiers; and determining, by the user equipment, the first correspondence relationship according to network slice identifiers carried in the uplink grants configured by the network-side device, and the fourth correspondence relationship between numerologies and the network slice identifiers. determining, by a user equipment, an uplink grant corresponding to a numerology configured by the network side for the user equipment, according to a first correspondence relationship between numerologies and uplink grants; determining, by the user equipment, one or more bearers corresponding to the numerology configured by the network side for the user equipment, according to a second correspondence relationship between the numerologies and bearers; and performing, by the user equipment, an uplink data operation according to the determined uplink grant corresponding to the numerology and the determined bearers corresponding to the numerology; determining, by the user equipment, the first correspondence relationship and/or the second correspondence relationship according to a configuration of a network-side device; wherein the method is characterised by determining, by the user equipment, the first correspondence relationship configured by the network-side device in a part or all of the following implementations: determining, by the user equipment, the first correspondence relationship according to network slice identifiers corresponding to the uplink grants configured by the network-side device, or network slice identifiers corresponding to the uplink data transmission resources corresponding to the uplink grants, and a fourth correspondence relationship between numerologies and the network slice identifiers; and determining, by the user equipment, the first correspondence relationship according to network slice identifiers carried in the uplink grants configured by the network-side device, and the fourth correspondence relationship between numerologies and the network slice identifiers. determining, by the user equipment, the first correspondence relationship according to network slice identifiers corresponding to the uplink grants configured by the network-side device, or network slice identifiers corresponding to the uplink data transmission resources corresponding to the uplink grants, and a fourth correspondence relationship between numerologies and the network slice identifiers; and determining, by the user equipment, the first correspondence relationship according to network slice identifiers carried in the uplink grants configured by the network-side device, and the fourth correspondence relationship between numerologies and the network slice identifiers.