A method of information transmission in an unlicensed band, performed by a terminal and comprising: listening to a channel of a first bandwidth part 'BWP' in an unlicensed band, to acquire a channel listening result, wherein the first BWP consists of more than one BWPs determined according to received uplink grant scheduling information and/or received pre-configured information for uplink transmission resource; activating, in a case that the channel listening result indicates that a BWP with an idle channel exists in the first BWP, at least one BWP selected from the BWP with the idle channel, to acquire a first active BWP; sending information to a network device on the first active BWP, characterized in that, listening to the channel of the first BWP in the unlicensed band, to acquire the channel listening result, comprises: simultaneously listening to channels of all BWPs among the first BWP in the unlicensed band, to acquire the channel listening result, wherein, activating, in a case that the channel listening result indicates that the BWP with the idle channel exists in the first BWP, the at least one BWP selected from the BWP with the idle channel to acquire the first active BWP, comprises: activating, in a case that the channel listening result indicates that channels of all BWPs among the first BWP are in an idle state, the all BWPs among the first BWP, to acquire the first active BWP; or, activating, in a case that the channel listening result indicates that channels of a part of BWPs in the first BWP are in the idle state, all BWPs having idle channels, to acquire the first active BWP, and continuing to listen to channels of remaining BWPs in the first BWP, and activating and adding, in a case that a channel of other BWP of the remaining BWPs is detected as idle, the other BWP to the first active BWP. listening to a channel of a first bandwidth part 'BWP' in an unlicensed band, to acquire a channel listening result, wherein the first BWP consists of more than one BWPs determined according to received uplink grant scheduling information and/or received pre-configured information for uplink transmission resource; activating, in a case that the channel listening result indicates that a BWP with an idle channel exists in the first BWP, at least one BWP selected from the BWP with the idle channel, to acquire a first active BWP; sending information to a network device on the first active BWP, characterized in that, listening to the channel of the first BWP in the unlicensed band, to acquire the channel listening result, comprises: simultaneously listening to channels of all BWPs among the first BWP in the unlicensed band, to acquire the channel listening result, wherein, activating, in a case that the channel listening result indicates that the BWP with the idle channel exists in the first BWP, the at least one BWP selected from the BWP with the idle channel to acquire the first active BWP, comprises: activating, in a case that the channel listening result indicates that channels of all BWPs among the first BWP are in an idle state, the all BWPs among the first BWP, to acquire the first active BWP; or, activating, in a case that the channel listening result indicates that channels of a part of BWPs in the first BWP are in the idle state, all BWPs having idle channels, to acquire the first active BWP, and continuing to listen to channels of remaining BWPs in the first BWP, and activating and adding, in a case that a channel of other BWP of the remaining BWPs is detected as idle, the other BWP to the first active BWP. activating, in a case that the channel listening result indicates that channels of all BWPs among the first BWP are in an idle state, the all BWPs among the first BWP, to acquire the first active BWP; or, activating, in a case that the channel listening result indicates that channels of a part of BWPs in the first BWP are in the idle state, all BWPs having idle channels, to acquire the first active BWP, and continuing to listen to channels of remaining BWPs in the first BWP, and activating and adding, in a case that a channel of other BWP of the remaining BWPs is detected as idle, the other BWP to the first active BWP.