An information transmission method applied in a Long Term Evolution, LTE system, the method comprising: receiving, by a receiving end device, first information sent by a sending end device in a first time unit; and sending, by the receiving end device, second information corresponding to the first information to the sending end device in a second time unit, wherein a duration of the first time unit is different from that of the second time unit, characterized in that, a subframe comprises M first time units, an ending moment of an ith first time unit in the M first time units is before a starting moment of an (i+1)th first time unit, or, the ending moment of the ith first time unit is the starting moment of the (i+1)th first time unit, wherein M is a positive integer and M≥1, i is set to be 0 when M is 1, and i is a positive integer and 1≤i≤M-1 when M>1; and a subframe comprises N second time units, an ending moment of a kth second time unit in the N second time units is before a starting moment of a (k+1)th second time unit, or, the ending moment of the kth second time unit in the N second time units is the starting moment of the (k+1)th second time unit, wherein N is a positive integer and N≥1, k is set to be 0 when N is 1, and k is a positive integer and 1≤k≤N-1 when N>1, wherein, when the method is applied to a Frequency Division Duplex, FDD system, M is a positive integer more than or equal to 6, and N is a positive integer more than or equal to 2, wherein receiving, by the receiving end device, the first information sent by the sending end device in the first time unit and sending, by the receiving end device, the second information corresponding to the first information to the sending end device in the second time unit comprise at least one of the following: receiving, by the receiving end device, the first information in any one of first M-3 first time units in a subframe a, and sending, by the receiving end device, the second information to the sending end device in the first one of second time units in a subframe a + 1, a being the subframe index number; or, receiving, by the receiving end device, the first information in any one of last three first time units in the subframe a, and sending, by the receiving end device, the second information to the sending end device in the second one of second time units in the subframe a + 1, a being the subframe index number. receiving, by a receiving end device, first information sent by a sending end device in a first time unit; and sending, by the receiving end device, second information corresponding to the first information to the sending end device in a second time unit, wherein a duration of the first time unit is different from that of the second time unit, characterized in that, a subframe comprises M first time units, an ending moment of an ith first time unit in the M first time units is before a starting moment of an (i+1)th first time unit, or, the ending moment of the ith first time unit is the starting moment of the (i+1)th first time unit, wherein M is a positive integer and M≥1, i is set to be 0 when M is 1, and i is a positive integer and 1≤i≤M-1 when M>1; and a subframe comprises N second time units, an ending moment of a kth second time unit in the N second time units is before a starting moment of a (k+1)th second time unit, or, the ending moment of the kth second time unit in the N second time units is the starting moment of the (k+1)th second time unit, wherein N is a positive integer and N≥1, k is set to be 0 when N is 1, and k is a positive integer and 1≤k≤N-1 when N>1, wherein, when the method is applied to a Frequency Division Duplex, FDD system, M is a positive integer more than or equal to 6, and N is a positive integer more than or equal to 2, wherein receiving, by the receiving end device, the first information sent by the sending end device in the first time unit and sending, by the receiving end device, the second information corresponding to the first information to the sending end device in the second time unit comprise at least one of the following: receiving, by the receiving end device, the first information in any one of first M-3 first time units in a subframe a, and sending, by the receiving end device, the second information to the sending end device in the first one of second time units in a subframe a + 1, a being the subframe index number; or, receiving, by the receiving end device, the first information in any one of last three first time units in the subframe a, and sending, by the receiving end device, the second information to the sending end device in the second one of second time units in the subframe a + 1, a being the subframe index number. receiving, by the receiving end device, the first information in any one of first M-3 first time units in a subframe a, and sending, by the receiving end device, the second information to the sending end device in the first one of second time units in a subframe a + 1, a being the subframe index number; or, receiving, by the receiving end device, the first information in any one of last three first time units in the subframe a, and sending, by the receiving end device, the second information to the sending end device in the second one of second time units in the subframe a + 1, a being the subframe index number.