To provide a measuring device, a measuring system and a measuring method capable of adding easily processing not integrated beforehand.

This measuring device is acquired by improving a measuring device for measuring an input signal from a test object or outputting an output signal to the test object. The device is provided with an operation means for operating the input signal or the output signal, a dynamic link library acquired by modularizing desired processing, and a linking means for linking the dynamic link library to the operation means. The operation means is characterized by operating based on the linked dynamic link library.