1. A portable information terminal separate from a charged particle beam irradiation apparatus for performing processing of a sample by irradiating the sample with a charged particle beam, the portable information terminal comprising:a display controller causing a display unit to display an image containing a graphical user interface (GUI) capable of operating a first operation item based on operation by a user, the first operation item being a part of operation items among a plurality of operation items operable in the charged particle beam irradiation apparatus; and
an output controller causing an output unit to output an output of a type according to the first operation item assigned to the GUI operated by the user, wherein
different first operation items are assigned to the GUI, and
the output unit is a speaker, and the output controller causes the output unit to output an audible sound of the type as the output of the type.