A method, an apparatus and a device of processing a terminal capability are provided and related to the field of communications. The method performed by a network-side device includes: receiving at least one set of downlink control channel monitoring capability information; wherein, each set of downlink control channel monitoring capability information includes: a minimum quantity of symbols in an interval between adjacent spans, a maximum quantity of consecutive symbols within a span, and at least one of following information: a quantity of blind detections and a quantity of non-overlapping Control Channel Elements CCEs supported by a terminal within a span.