Apparatus of synchronizing a video synchronizing signal with another signal and method of controlling the apparatus

An apparatus comprising:

• a receiving unit that receives (i) synchronization format information regarding a vertical synchronizing frequency and a horizontal synchronizing frequency of a first video synchronizing signal and (ii) phase difference information indicating a phase difference between the first video synchronizing signal and a first reference signal synchronized with a grand master clock;
• and
• a generating unit that generates a second video synchronizing signal that synchronizes with the first video synchronizing signal, based on the synchronization format information, the phase difference, and a second reference signal synchronized with the grand master clock.

A method comprising:

• receiving (i) synchronization format information regarding a vertical synchronizing frequency and a horizontal synchronizing frequency of a first video synchronizing signal and (ii) phase difference information indicating a phase difference between the first video synchronizing signal and a first reference signal synchronized with a grand master clock;
• and
• generating a second video synchronizing signal that synchronizes with the first video synchronizing signal, based on the synchronization format information, the phase difference, and a second reference signal synchronized with the grand master clock.