PROBLEM TO BE SOLVED: To obtain the position of a work machine. Provided is a system including a work machine including a work machine main body, a work machine attached to the work machine main body, an operation member for operating the work machine, and a computer 102A. The computer 102A has a learned position estimation model 80B for obtaining the position of the position estimation target portion of the work machine. The computer 102A acquires an operation command value for operating the work machine by operating the operation member, estimates the displacement amount from the reference position of the position estimation target portion from the operation command value using the learned position estimation model 80B, The estimated position obtained by estimating the position of the position estimation target portion from the reference position and the displacement amount is output. [Selection diagram] Fig. 6
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