According to one aspect of the invention, there is provided a mobile apparatus including: a sensor configured to detect acceleration applied to the mobile apparatus and to generate a detection signal; a memory configured to record count data based on the detection signal, the count data associated with movement of the mobile apparatus; a counting module configured to count the number of user's steps based on the count data; a sound module configured to sound; and a counting control module configured to control the counting module to stop counting of the number of user's steps when the sound module starts sounding.