1. An average calculation device for calculating an average of non-linear data, the device comprising: an input module for receiving a nonlinear function F and nonlinear data y 1 and y 2 ; a comparison module for deriving nonlinear data c 1 and c 2 sorted in a descending order by comparing the received nonlinear data y 1 and y 2 ; an index module for deriving an index value d 1 from the sorted nonlinear data c 1 and c 2 according to a preset computation; a lookup table memory for storing a lookup table (LUT) of the index value d 1 and a variable B in advance using a preset computation formula, and deriving a variable B corresponding to an index value if the index value d 1 is received; and a computation module for receiving c 1 among the sorted nonlinear data and the variable B and deriving a final nonlinear output value A through a preset computation.