In the learning apparatus, a memory stores a dictionary in an updatable manner, and an inputting means inputs data when an instruction is input by a user. An outputting part processes the data inputted through the inputting part by using the dictionary stored in the memory, and outputs the result of the processing. An identifier receiver obtains an identifier of the user or a group to which the user belongs. An updating means updates the dictionary only when the identifier obtained by the identifier receiver is pre-registered in the memory.