The invention provides a support system for searching for a function, including: a first storage for storing a history of at least one output parameter of each of a plurality of functions; an input section for receiving an input of an output parameter expected as an output of a function for a search; a calculating section for calculating first indexes respectively indicating proximity of the output parameter as inputted to each of those stored in the first storage, and summing the calculated first indexes for each function; and an output section for selecting, from among the plurality of functions, a function having a sum of the first indexes larger than a predetermined value, and outputting the selected function.