Golf ball location ascertaining method and a golf play information providing system

A golf ball location ascertaining method comprising:

• a step of checking whether a golfer takes a swing motion in a golf field;
• a step of ascertaining a motion location at which the swing motion is taken when it is determined that the swing motion is taken;
• and
• a step of ascertaining a location of the golf ball on a golf course by using golf course data on the golf field and the motion location,
• wherein there are a plurality of golfers, each of the plurality of golfers has a portable device capable of ascertaining his or her location, and whether the swing motion is made can be ascertained by checking a positional relationship between the plurality of golfers, and
• wherein when any one of the plurality of golfers is positioned to be spaced apart from the other golfers positioned adjacent to each other for a predetermined time, a current location of the spaced apart golfer is considered as the motion location at which the swing motion is taken.

A golf ball location ascertaining method comprising:

• a step of checking whether a golfer takes a swing motion in a golf field;
• a step of ascertaining a motion location at which the swing motion is taken when it is determined that the swing motion is taken;
• and
• a step of ascertaining a location of the golf ball on a golf course by using golf course data on the golf field and the motion location,
• wherein there are a plurality of golfers, each of the plurality of golfers has a portable device capable of ascertaining his or her location, and whether the swing motion is made can be ascertained by checking a relative positional relationship between the plurality of golfers.