TIME SYNCHRONIZER

PROBLEM TO BE SOLVED: To realize a system to suppress a synchronization error to be caused during time synchronization processing due to a load of a communication route to be connected among computers when time of a built-in clock of each computer is synchronized among a plurality of computers. SOLUTION: Time information with a little delay time due to the communication route in the time synchronization processing is acquired by transmitting a supplementary time synchronization packet to a computer 101 to offer standard time by a computer 102 to be synchronized, corrected time of the computer 102 to the computer 101 is calculated, based on the time information and the time of the computer 101 is corrected. Furthermore, delay time calculated in the past time synchronization processing is stored and the corrected time is calculated, based on the time information.