A method for allocating resources, comprising: defining multiple carriers as at least one carrier group according to a preset condition, wherein the preset condition comprises at least one of the followings: defining carriers that have same cell coverage as one carrier group; and defining multiple carriers that have a same uplink/downlink timeslot ratio as one carrier group; and allocating system resources for an obtained carrier group; notifying a user equipment, UE, of system resource allocation information, so that the system resources corresponding to the allocation information are used for communication with the UE; wherein the defining multiple carriers as the at least one carrier group according to the preset condition comprises: performing, according to the preset condition, definition for an uplink carrier and a downlink carrier corresponding to the uplink carrier to obtain the at least one carrier group, wherein each carrier group comprises at least one uplink carrier and a downlink carrier corresponding to the uplink carrier; or grouping, according to the preset condition, the uplink carriers to obtain at least one uplink carrier subgroup; grouping, according to the preset condition, the downlink carriers to obtain at least one downlink carrier subgroup; and establishing a mapping relationship between the uplink carrier subgroup and the downlink carrier subgroup to obtain the at least one carrier group, wherein each carrier group comprises at least one uplink carrier subgroup and at least one downlink carrier subgroup, and the mapping relationship between the uplink carrier subgroup and the downlink carrier subgroup is an original setting in a system or is dynamically allocated in a system application. defining multiple carriers as at least one carrier group according to a preset condition, wherein the preset condition comprises at least one of the followings: defining carriers that have same cell coverage as one carrier group; and defining multiple carriers that have a same uplink/downlink timeslot ratio as one carrier group; and allocating system resources for an obtained carrier group; notifying a user equipment, UE, of system resource allocation information, so that the system resources corresponding to the allocation information are used for communication with the UE; wherein the defining multiple carriers as the at least one carrier group according to the preset condition comprises: performing, according to the preset condition, definition for an uplink carrier and a downlink carrier corresponding to the uplink carrier to obtain the at least one carrier group, wherein each carrier group comprises at least one uplink carrier and a downlink carrier corresponding to the uplink carrier; or grouping, according to the preset condition, the uplink carriers to obtain at least one uplink carrier subgroup; grouping, according to the preset condition, the downlink carriers to obtain at least one downlink carrier subgroup; and establishing a mapping relationship between the uplink carrier subgroup and the downlink carrier subgroup to obtain the at least one carrier group, wherein each carrier group comprises at least one uplink carrier subgroup and at least one downlink carrier subgroup, and the mapping relationship between the uplink carrier subgroup and the downlink carrier subgroup is an original setting in a system or is dynamically allocated in a system application. performing, according to the preset condition, definition for an uplink carrier and a downlink carrier corresponding to the uplink carrier to obtain the at least one carrier group, wherein each carrier group comprises at least one uplink carrier and a downlink carrier corresponding to the uplink carrier; or grouping, according to the preset condition, the uplink carriers to obtain at least one uplink carrier subgroup; grouping, according to the preset condition, the downlink carriers to obtain at least one downlink carrier subgroup; and establishing a mapping relationship between the uplink carrier subgroup and the downlink carrier subgroup to obtain the at least one carrier group, wherein each carrier group comprises at least one uplink carrier subgroup and at least one downlink carrier subgroup, and the mapping relationship between the uplink carrier subgroup and the downlink carrier subgroup is an original setting in a system or is dynamically allocated in a system application.