An input processor such as table calculator comprises input means for putting numerical data in said processor; memory means for storing first n-digit numerical data put in by said input means; reading means for reading out said stored first n-digit data from said memory means and processing means for arranging said first n-digit numerical data read out by said reading means and second m-digit numerical data newly put in by said input means in neighboring relation thereby forming a new n+m-digit numerical data therefrom.