A radiation imaging apparatus includes one or more processors and one or more memories storing, as one or more computer programs, computer-readable instructions to be executed by the processors to be performed a process including: obtaining a first imaging protocol including one or more parameters concerning radiation imaging; searching a plurality of imaging protocols stored in a storage unit for a second imaging protocol differing in some parameters from the obtained imaging protocol; causing a display unit to display a user interface for selecting an imaging protocol as a replacement destination of the first imaging protocol from the second imaging protocol specified when the second imaging protocol is specified by the process of searching; and replacing the first imaging protocol with the selected second imaging protocol in accordance with an instruction from an operator to the user interface.