A communication apparatus (11, 201) which is capable of performing wireless communication by using a first communication system and a second communication system, the apparatus (11, 201) comprising: performing means for performing one of a first operation mode, a second operation mode, and a third operation mode, wherein the first operation mode is an operation mode used in the second communication system and in which the communication apparatus (11, 201) communicates via a first wireless network established by the communication apparatus (11, 201), the second operation mode is an operation mode used in the second communication system and in which the communication apparatus (11, 201) communicates via a second wireless network established by an external apparatus, and the third operation mode is an operation mode maintaining the first wireless network while maintaining connection with the external apparatus via the second wireless network by concurrently performing an operation in the first operation mode and an operation in the second operation mode; display control means for controlling a display unit to display a selection screen for causing a user to select one of information according to the first operation mode and information according to the second operation mode as information to be written to a memory and obtained by another communication apparatus in a case where the performing means is performing the third operation mode, wherein the memory is a read-write non-volatile memory that may be updated using near field wireless communication; selection means for selecting, one of the information according to the first operation mode and the information according to the second operation mode as information to be obtained from the communication apparatus (11, 201) by the other communication apparatus, based on a selection by the user via the selection screen displayed by the display control means; and communication means for performing wireless communication with the other communication apparatus having obtained the information from the communication apparatus (11, 201) using the first communication system in an operation mode according to the information selected via the selection means, in a case where the performing means is performing the third operation mode. performing means for performing one of a first operation mode, a second operation mode, and a third operation mode, wherein the first operation mode is an operation mode used in the second communication system and in which the communication apparatus (11, 201) communicates via a first wireless network established by the communication apparatus (11, 201), the second operation mode is an operation mode used in the second communication system and in which the communication apparatus (11, 201) communicates via a second wireless network established by an external apparatus, and the third operation mode is an operation mode maintaining the first wireless network while maintaining connection with the external apparatus via the second wireless network by concurrently performing an operation in the first operation mode and an operation in the second operation mode; display control means for controlling a display unit to display a selection screen for causing a user to select one of information according to the first operation mode and information according to the second operation mode as information to be written to a memory and obtained by another communication apparatus in a case where the performing means is performing the third operation mode, wherein the memory is a read-write non-volatile memory that may be updated using near field wireless communication; selection means for selecting, one of the information according to the first operation mode and the information according to the second operation mode as information to be obtained from the communication apparatus (11, 201) by the other communication apparatus, based on a selection by the user via the selection screen displayed by the display control means; and communication means for performing wireless communication with the other communication apparatus having obtained the information from the communication apparatus (11, 201) using the first communication system in an operation mode according to the information selected via the selection means, in a case where the performing means is performing the third operation mode.