1. A memory system, comprising memory means for storing first information on a symbol in a way to strengthen a connection between relevant input neurons and competitive neurons in response to input patterns of a variety of inputs for each symbol, with the use of a competitive neural network having an input layer composed of a plurality of said input neurons and a competitive layer composed of a plurality of said competitive neurons, wherein said memory means stores, in a frame form, second information on said symbol supplied separately from said variety of inputs in relation to said competitive neurons corresponding to said symbol.