A mobile terminal includes an instrument specifying information acquiring portion that acquires instrument specifying information for specifying an instrument as a diagnostic subject, an equipment information acquiring portion that acquires, from a controlling device that controls equipment information pertaining to equipment that are provided with instruments, equipment information corresponding to the instrument specifying information, a diagnostic data acquiring portion that collects diagnostic data for the instrument using a data collecting device corresponding to a data categorization that is included in the equipment information acquired by the equipment information acquiring portion, an evaluating portion that evaluates whether or not there is a problem with the instrument by comparing proper-operation data for the instrument, included in the equipment information acquired by the equipment information acquiring portion, to the diagnostic data collected by the diagnostic data acquiring portion, and an outputting portion that outputs the evaluation result by the evaluating portions.