A voice recording/reproducing apparatus incorporates a storage portion, a communication portion and a control unit. The storage portion incorporates a voice-data region and an index-information region. The communication portion establishes communication with an external communication apparatus. The control unit controls writing of voice data converted into digital signals and index information concerning voice data on the voice-data region and the index-information region of the storage portion and reading of voice data stored in the voice-data region in accordance with index information concerning voice data stored in the index-information region of the storage portion and interrupting a communication mode under a predetermined condition of a communication operation concerning a process for transmitting voice data stored in the voice-data region of the storage portion to the external communication apparatus during the communication mode in which the communication portion is caused to establish communication with the external communication apparatus so that a power source of the voice recording/reproducing apparatus is limited to small power consumption to put the voice recording/reproducing apparatus into a standby mode.