A mobile phone (mobile electronic device) includes an acceleration sensor that detects an acceleration, a communication module that performs communication, and a controller. When the number of steps based on the acceleration detected by the acceleration sensor has reached a first step count during an ON-state of the communication function of the communication module, the mobile phone shifts from a stop state to a walking state. The controller maintains the ON-state of the communication function of the communication module when the mobile phone shifts from the stop state to the walking state. The controller turns OFF the communication function of the communication module when the number of steps based on the acceleration has reached a second step count larger than the first step count.