To suppress fluctuation of print position regardless of deviation or speed change of a carriage.

In an ink jet recording printer where a carriage mounting a print head performs scanning orthogonally to the carrying direction of recording medium, a speed detection section 42 detects speed information sequentially at the time of scanning with the carriage, and a delay circuit 46 corrects the print position dynamically in the scanning direction based on the detected speed information with reference to a table 45. According to the method, printing can be performed even in the nonconstant scanning region of the carriage.