To shorten a time required to make each wireless communication part communication-enabled while suppressing power consumption of a portable electronic device having a plurality of wireless communication parts.

A portable telephone device 1 determines whether or not a portable telephone communication part 13 and a wireless LAN communication part 14 are used respectively after power-on, based on communication system information stored preliminarily in a storage part 12. After the determination, the portable telephone communication part 13 is initialized and made transition to a stand-by state or a dormant state depending on the determination result. Next, the wireless LAN communication part 14 is initialized and made transition to a stand-by state or a dormant state depending on the determination result. When an application that uses the wireless communication part in the dormant state is started up, the wireless communication part is made transition from the dormant state to the stand-by state.