1. An information processing apparatus, which creates a tree structure used by a recognition apparatus which recognizes specific information using the tree structure, comprising: memory means which stores data including the information to be recognized and data not including the information so as to correspond to a label showing whether or not the data includes the information; a recognition device which recognizes the information and outputs a high score value when the data including the information is input; and grouping means which performs grouping of the recognition devices using a score distribution obtained when the data is input into the recognition devices.