An image processing apparatus for supplying print data to a printing apparatus that performs printing with recording agents. The image processing apparatus includes a print-data generation unit for generating a predetermined group of print data for continuous printing, a remaining-amount detection unit for detecting the remaining amount of each of the recording agents, and a comparison unit for obtaining an estimated consumption of at least one of the recording agents required to print the print data if the one recording agent is substituted for another recording agent to perform printing and comparing the estimated consumption with the remaining amount of the corresponding recording agent. The image processing apparatus further includes a print control unit for controlling the printing apparatus to print the print data if the remaining amount of at least the one recording agent exceeds its estimated consumption.