The invention relates to a cumulative attack time decision facility, which has less capital outlay and can encourage the ball team for offensive football, and the running method of the facility, wherein the time accumulation network display devices are positioned on both sides of the court and an offence-defense conversion delimitation mark is positioned in the court inbounds. After the team controlling the ball sends the ball over the offence-defense conversion delimitation mark into the opponent region, the display devices on both sides begin to synchronously display the cumulative attack time data. Finally, the leading team with strong offensive can be recognized.