1. A writing apparatus comprising: a writing unit configured to write a pattern onto a target workpiece, based on a writing data of the pattern to be written on the target workpiece; and a generation unit configured to generate, after the pattern has been written, writing data of a figure code indicating a writing information of when the target workpiece is written, based on the writing information, wherein the writing unit further writes the figure code onto the target workpiece, based on the writing data of the figure code.