A communications method performed by a terminal, the method comprising: • receiving (S 102) first information from a network device, wherein the first information is used to indicate a location of a channel bandwidth of the terminal in a channel bandwidth of the network device, ∘ wherein: ▪ the channel bandwidth of the terminal is a radio frequency bandwidth, ▪ the radio frequency bandwidth comprises an uplink transmission resource or a downlink transmission resource, ▪ a bandwidth part, BWP, of the terminal corresponds to the channel bandwidth of the terminal, the BWP being formed by several contiguous frequency domain resource units, ∘ wherein: ▪ the first information is used to, for indicating the location of the channel bandwidth of the terminal, indicate an offset of a n th resource unit in the channel bandwidth of the terminal relative to a reference resource unit in the frequency domain, wherein n is a positive integer less than or equal to M, and M is a quantity of resource units in the channel bandwidth of the terminal and the reference resource unit is a predefined resource unit; and • determining (S 103) the location of the channel bandwidth of the terminal based on the first information. • receiving (S 102) first information from a network device, wherein the first information is used to indicate a location of a channel bandwidth of the terminal in a channel bandwidth of the network device, ∘ wherein: ▪ the channel bandwidth of the terminal is a radio frequency bandwidth, ▪ the radio frequency bandwidth comprises an uplink transmission resource or a downlink transmission resource, ▪ a bandwidth part, BWP, of the terminal corresponds to the channel bandwidth of the terminal, the BWP being formed by several contiguous frequency domain resource units, ∘ wherein: ▪ the first information is used to, for indicating the location of the channel bandwidth of the terminal, indicate an offset of a n th resource unit in the channel bandwidth of the terminal relative to a reference resource unit in the frequency domain, wherein n is a positive integer less than or equal to M, and M is a quantity of resource units in the channel bandwidth of the terminal and the reference resource unit is a predefined resource unit; and ∘ wherein: ▪ the channel bandwidth of the terminal is a radio frequency bandwidth, ▪ the radio frequency bandwidth comprises an uplink transmission resource or a downlink transmission resource, ▪ a bandwidth part, BWP, of the terminal corresponds to the channel bandwidth of the terminal, the BWP being formed by several contiguous frequency domain resource units, ▪ the channel bandwidth of the terminal is a radio frequency bandwidth, ▪ the radio frequency bandwidth comprises an uplink transmission resource or a downlink transmission resource, ▪ a bandwidth part, BWP, of the terminal corresponds to the channel bandwidth of the terminal, the BWP being formed by several contiguous frequency domain resource units, ∘ wherein: ▪ the first information is used to, for indicating the location of the channel bandwidth of the terminal, indicate an offset of a n th resource unit in the channel bandwidth of the terminal relative to a reference resource unit in the frequency domain, wherein n is a positive integer less than or equal to M, and M is a quantity of resource units in the channel bandwidth of the terminal and the reference resource unit is a predefined resource unit; and ▪ the first information is used to, for indicating the location of the channel bandwidth of the terminal, indicate an offset of a n th resource unit in the channel bandwidth of the terminal relative to a reference resource unit in the frequency domain, wherein n is a positive integer less than or equal to M, and M is a quantity of resource units in the channel bandwidth of the terminal and the reference resource unit is a predefined resource unit; and • determining (S 103) the location of the channel bandwidth of the terminal based on the first information.