An electromyography processing apparatus 1 includes a storage device 10 that stores electromyography data 11 of a predetermined muscle, and a balance indicator processing unit 28 that calculates a root-mean-square value of the electromyography for each predetermined time, repeats a process for each of pieces of electromyography data of each of a plurality of muscles, the process being of outputting, as a balance evaluation value of the predetermined muscle, a value acquired by subjecting, to time differentiation, the time course of an average value of the root-mean-square value in a sliding window for calculating balance evaluation value, and outputs a balance indicator based on a balance evaluation value of each of the plurality of muscles.
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