The present invention relates to a record media written with a data structure used in recognizing specific users in hardware such as a robot, etc., a method for recognizing a user by using a data structure written in the record media, and a user identification database access method for the user identification software component application programming interface (API) and an error handling method in the user identification software component API. Among the user identification elements, in particular, the present invention relates to a method for building a database of image data for the user's clothes, and a performance evaluation of a vision-based recognizer, which is means for recognizing the user's image information for the clothes.