An arithmetic device for presenting a motion trajectory with exercise intensity, comprising: a memory unit, a communication unit, a display unit, and a processing unit. The display unit is used to display motion information. The processing unit is coupled to the memory unit, the communication unit, and the display unit, and configured to collect the positioning data and the heart rate data over time and record the data in the memory unit, and generate the positioning data document according to at least the positioning data, and the processing unit is configured according to the positioning data. The document and the corresponding heart rate data control display unit present a motion trajectory, wherein when the control display unit presents the motion trajectory, the processing unit determines the corresponding part of the motion trajectory according to which of the plurality of heart rate intervals the value of the corresponding heart rate data falls. Which of a plurality of display formats is presented, thereby presenting a motion trajectory with exercise intensity.以運動強度呈現運動軌跡的運算裝置，包含：記憶單元、通訊單元、顯示單元、處理單元。顯示單元用於顯示運動資訊。處理單元係與記憶單元、通訊單元、顯示單元耦接，且用於隨時間收集定位資料和心率資料並據以記錄於記憶單元中，並至少依據定位資料產生定位資料文檔，處理單元依據定位資料文檔及對應的心率資料控制顯示單元呈現運動軌跡，其中於控制顯示單元呈現運動軌跡時，處理單元依據對應的心率資料的數值落於複數個心率區間中哪一個區間而決定運動軌跡中對應的部分以複數種顯示格式中哪一種格式來呈現，藉此以運動強度呈現運動軌跡。
