1. A key-in device, comprising: a key-in section including a matrix array of operation keys; input pattern memory means, coupled to said key-in section, for storing an input pattern corresponding to at least one character by receiving coordinate data corresponding to individual operation keys of said key-in section, when the one character is input by a manual stroking operation on said key-in section, and for sequentially storing the coordinate data in such a manner as to divide the input character into its respective strokes; standard pattern memory means for storing, as a standard pattern, character data of a character to be recognized, first feature data associated with the direction of each stroke of the respective character and second feature data relating to positions of the starting and ending points of each stroke of the respective character; means coupled to said input pattern memory means, which forms the first feature data associated with the direction of each stroke of the input character and the second feature data relating to positions of the starting and ending points of each stroke of said input character on the basis of the input pattern which is stored in said input pattern memory means; and means, coupled to said standard pattern memory means and said means for forming the first and second feature data, for recognizing the keyed-in character by detecting the first and second feature data in said standard pattern memory which coincides with the first and second feature data formed by said first and second feature data forming means, and for selecting the corresponding character data stored in said standard pattern memory means.