Image processing apparatus, method and non-transitory computer readable medium storing program with variable polling interval

An image processing apparatus includes: an acquiring unit that acquires a display request including a first external apparatus identification information and screen identification information; a storage unit storing external apparatus screen information; an update unit updating the first external apparatus screen information whenever the display request is acquired; a determining unit determining a polling interval for a first external apparatus on the basis of the stored external apparatus screen information; and a transmitting unit transmitting, to the first external apparatus, screen data which includes information of the determined polling interval, wherein, when a second external apparatus identification information item corresponding to the same screen identification information as that in the display request is stored in the storage unit, the determining unit determines the polling interval for the first external apparatus to be less than that for a second external apparatus indicated by the second external apparatus identification information item.