1. A recording media processing device comprising: a magnetic reading unit that magnetically reads a magnetic ink character line recorded on a recording medium; and a character recognition unit that detects a first peak in signal waveform data acquired by the magnetic reading unit reading the magnetic ink character line, extracts character waveform data from the signal waveform data in an area corresponding to one magnetic ink character contained in the magnetic ink character line based on the position of the detected first peak, applies a magnetic recognition process to the extracted character waveform data to recognize the magnetic ink character, acquires a recognition string corresponding to the magnetic ink character line, and when the first peak in the character waveform data of a target character located at an end of the recognition string is within a specific range from an end of the character waveform data and a space is beside the target character, or when a space is on both sides of the target character in the recognition string, determines if the target character is noise.