An information sending method, comprising: obtaining, by a terminal, an index field and a sum field carried on a detected downlink control channel in a first downlink subframe and a first indication field from a network device; determining, by the terminal according to the downlink control channel in the first downlink subframe, the first downlink subframe scheduled by the network device; determining, by the terminal, to send first feedback information for the first downlink subframe to the network device in an uplink subframe, wherein a first codebook of the first feedback information is determined according to the index field, the sum field and the first indication field, and the first codebook is corresponding to the first downlink subframe in a downlink subframe set of the terminal that is actually scheduled by the network device, and the terminal is a terminal supporting carrier aggregation, CA; and sending, by the terminal, the first feedback information to the network device; wherein a value of the index field is a count value obtained by performing accumulative counting in a carrier-first and subframe second order in the downlink subframe set; the sum field indicates a total quantity of scheduled downlink subframes of the terminal in a first downlink subframe set corresponding to a first downlink subframe number of the first downlink subframe in the downlink subframe set and in a second downlink subframe set corresponding to subframe numbers of all downlink subframes before a subframe moment of the first downlink subframe number in the downlink subframe set; and the first indication field indicates a total quantity of downlink subframes in the downlink subframe set. obtaining, by a terminal, an index field and a sum field carried on a detected downlink control channel in a first downlink subframe and a first indication field from a network device; determining, by the terminal according to the downlink control channel in the first downlink subframe, the first downlink subframe scheduled by the network device; determining, by the terminal, to send first feedback information for the first downlink subframe to the network device in an uplink subframe, wherein a first codebook of the first feedback information is determined according to the index field, the sum field and the first indication field, and the first codebook is corresponding to the first downlink subframe in a downlink subframe set of the terminal that is actually scheduled by the network device, and the terminal is a terminal supporting carrier aggregation, CA; and sending, by the terminal, the first feedback information to the network device; wherein a value of the index field is a count value obtained by performing accumulative counting in a carrier-first and subframe second order in the downlink subframe set; the sum field indicates a total quantity of scheduled downlink subframes of the terminal in a first downlink subframe set corresponding to a first downlink subframe number of the first downlink subframe in the downlink subframe set and in a second downlink subframe set corresponding to subframe numbers of all downlink subframes before a subframe moment of the first downlink subframe number in the downlink subframe set; and the first indication field indicates a total quantity of downlink subframes in the downlink subframe set.