1. An information processing apparatus which controls a process for input position information on the basis of the position information, comprising: receive means for receiving input position information in an operation window; calculation means for calculating an interpretation result for an input position and a confidence score of the interpretation result on the basis of the input position information received by said receive means; and change means for changing display contents in the operation window on the basis of the confidence score calculated by said calculation means in presenting a candidate for the interpretation result.