To perform certain connection to an SNTP server set by a user, to first acquire a time of the SNTP server by user operation, and to start synchronization after user confirmation to prevent connection to an erroneous server or erroneous time adjusting.

This device having a time synchronization function using an SNTP protocol actually acquires time information from the SNTP server, displays the acquired time, and sets the acquired time as a time of the device itself when an instruction of a time synchronization start is given, and starts time synchronization.