Shifting a power state of an image processing apparatus based on a command from an information processing apparatus

An image forming system comprising:

• an image forming apparatus configured to form an image on a sheet based on image data, and an image processing apparatus configured to receive a print data from an external device, generate image data based on the print data, and send the image data to the image forming apparatus,
• wherein the image processing apparatus includes:
• first interface configured to send a plurality of requests to the image forming apparatus,
• wherein the image forming apparatus includes:
• a second interface configured to receive the request from the image processing apparatus and sends a response to the request to the image processing apparatus,
• a power control unit configured to shift a power state of the image forming apparatus from a first power state to a second power state in which power consumption is lower than power consumption in the first power state, wherein the second interface receives a first type request from the information processing apparatus when the image forming apparatus is in the second power state and sends a response to the first type request to the image processing apparatus while maintaining the first power state,
• wherein, when a condition for shifting the power state of the image forming apparatus from the first power state to the second power state is satisfied, the second interface sends a predetermined information to the image processing apparatus and the power control unit shifts the power state of the image forming apparatus from the first power state to the second power state,
• wherein the first interface stops sending a second type request different from the first type request to the image forming apparatus and does not stop sending the first type request to the image forming apparatus according to the predetermined information.