A training supporting system has a training supporting apparatus and an exercise form analyzing apparatus, the both apparatuses being connected to each other through a communication network. The training supporting apparatus is worn on the arm of a user and measures acceleration rates of motion of the user's body where the apparatus is fitted on, at least in the three directions along X-, Y- and Z-axes, while the user is walking or running. Receiving the measured acceleration rates from the training supporting apparatus through the communication network, the exercise form analyzing apparatus analyzes an exercise form including balance between arm swing and foot landing, and sends back the analysis result of the exercise form to the training supporting apparatus through the communication network.