1. A culture medium information registration system comprising: an obtaining unit which obtains culture medium image data including a culture medium image created by imaging a culture medium on which food is cultured as a specimen; an extracting unit which extracts two or more feature values related to a color of each pixel constituting the culture medium image; a calculation unit which executes statistical analysis based on distribution of pixels of the culture medium image by using a coordinate system prescribed by the extracted two or more feature values of each pixel, and calculates a model function prescribing relation of the two or more feature values in each pixel; a detection unit which detects colonies in the culture medium image based on the calculated model function; a count unit which counts a number of detected colonies; and a registration unit which registers information related to the culture medium including at least the counted number of colonies with a database as culture medium information.