A Physical Downlink Control Channel, PDCCH, monitoring occasion determination method, performed by a terminal device, the method comprising: determining at least one PDCCH monitoring occasion group based on a first PDCCH search space and a maximum PDCCH repetition number configured by a network device; and determining, in each of the at least one PDCCH monitoring occasion group, a PDCCH candidate set corresponding to each PDCCH repetition number R, wherein each PDCCH candidate in the PDCCH candidate set comprises R consecutive PDCCH monitoring occasions, and R is a positive integer in the interval [1, Rmax], where Rmax is a maximum PDCCH repetition number; the method characterised in that determining the at least one PDCCH monitoring occasion group based on the first PDCCH search space and the maximum PDCCH repetition number configured by the network device comprises: determining the at least one PDCCH monitoring occasion group according to a comparison relationship between the number N of PDCCH monitoring occasions comprised in the first PDCCH search space in one PDCCH search space periodicity and the maximum PDCCH repetition number Rmax; wherein determining the at least one PDCCH monitoring occasion group according to the comparison relationship between the number N of PDCCH monitoring occasions comprised in the first PDCCH search space in one PDCCH search space periodicity and the maximum PDCCH repetition number Rmax comprises: when N is greater than or equal to Rmax, starting from the first PDCCH monitoring occasion in the PDCCH search space periodicity, determining every Rmax consecutive PDCCH monitoring occasions as one PDCCH monitoring occasion group. determining at least one PDCCH monitoring occasion group based on a first PDCCH search space and a maximum PDCCH repetition number configured by a network device; and determining, in each of the at least one PDCCH monitoring occasion group, a PDCCH candidate set corresponding to each PDCCH repetition number R, wherein each PDCCH candidate in the PDCCH candidate set comprises R consecutive PDCCH monitoring occasions, and R is a positive integer in the interval [1, Rmax], where Rmax is a maximum PDCCH repetition number; the method characterised in that determining the at least one PDCCH monitoring occasion group based on the first PDCCH search space and the maximum PDCCH repetition number configured by the network device comprises: determining the at least one PDCCH monitoring occasion group according to a comparison relationship between the number N of PDCCH monitoring occasions comprised in the first PDCCH search space in one PDCCH search space periodicity and the maximum PDCCH repetition number Rmax; wherein determining the at least one PDCCH monitoring occasion group according to the comparison relationship between the number N of PDCCH monitoring occasions comprised in the first PDCCH search space in one PDCCH search space periodicity and the maximum PDCCH repetition number Rmax comprises: when N is greater than or equal to Rmax, starting from the first PDCCH monitoring occasion in the PDCCH search space periodicity, determining every Rmax consecutive PDCCH monitoring occasions as one PDCCH monitoring occasion group. determining the at least one PDCCH monitoring occasion group according to a comparison relationship between the number N of PDCCH monitoring occasions comprised in the first PDCCH search space in one PDCCH search space periodicity and the maximum PDCCH repetition number Rmax; wherein determining the at least one PDCCH monitoring occasion group according to the comparison relationship between the number N of PDCCH monitoring occasions comprised in the first PDCCH search space in one PDCCH search space periodicity and the maximum PDCCH repetition number Rmax comprises: when N is greater than or equal to Rmax, starting from the first PDCCH monitoring occasion in the PDCCH search space periodicity, determining every Rmax consecutive PDCCH monitoring occasions as one PDCCH monitoring occasion group.