Disclosed are a mobile and expandable firmware-based optical spectroscopy system and a method for controlling same. The optical spectroscopy system may comprise: a wearing part attached to a particular region of a subject to irradiate light, on the basis of a firmware, to the particular region and measure the bodily signals of the subject by collecting emergent light which has passed through the particular region； and a monitoring unit, connected to the wearing part via a wired or wireless network, for controlling the strength of the light irradiated from the wearing part.
