1. An X-ray computed tomography imaging apparatus comprising: an X-ray generation unit configured to generate an X-ray; an X-ray detection unit configured to detect an X-ray which has been generated from the X-ray generation unit and has passed through a subject; a scan control unit configured to control the X-ray generation unit and the X-ray detection unit in order to execute a scan targeting the subject; a storage unit configured to store, for each of a plurality of examination protocols including a plurality of scan types, relevance, between scan types, of a plurality of setting items including setting items for imaging conditions and setting items for reconstruction conditions of each scan type of each examination protocol; an input unit configured to accept an instruction from a user to set imaging conditions and reconstruction conditions of at least one scan type of an examination protocol to be set; and a setting unit configured to set, in accordance with relevance regarding examination protocol to be set that is stored in the storage unit, in synchronism with an instruction from the input unit, item values of a plurality of setting items included in the imaging conditions and reconstruction conditions of the at least one scan type of the examination protocol to be set.