Patent ID: 7949120

Claim:
An information processing system comprising a first computer and second computer which mutually communicate via a data communication line, said first computer comprising a first time counter which measures current time values and said second computer comprising a second time counter configured for current time values, said first computer comprising first communication means for communicating with said second computer via said data communication line and said second computer comprising second communication means for communicating with said first computer via said data communication line, wherein: said first communication means periodically or at irregular intervals transmits a first time point value via said data communication line to said second communication means, said first time point value expressing a current time point as measured by said first time counter prior to commencement of said transmission operation, and said second computer comprises delay calculation means for receiving said first time point value from said second communication means, and for calculating a communication delay amount based on a difference between said first time point value and a second time point value, said second time point value being measured as a current time point by said second time counter subsequent to reception of said first time point value, said communication delay amount thereby including a time interval that elapses in transmitting data from said first computer to said second computer via said data communication line.