A display device of a body building machine, comprising: a control portion having as plurality of buttons for controlling the setting of the setting of the processing and display unit; the processing and display unit having a display panel which can display objects by various colors; the processing and display unit serves to display various information in exercise; the display panel displaying the various states of various items by different colors; tech item and state can be represented independent for alerting the users. In the display panel, the set data is represented by a first color; when the data is changed at an initial state, a second color different from the first color is used to display the data. The processing and display unit displays the data about exercise time, exercise speed, pulses, and heat consumption.