The image processing apparatus has a timer transmission function to execute a transmission job for transmitting image data to another apparatus at a designated transmission time of day. The image processing apparatus comprises a setting unit configured to set a restraint period of time indicating a period of time that the execution of the transmission job has to be restrained based on charge information for respective periods of time including unit prices of electricity charges for respective periods of time; and a reservation unit configured to present the restraint period of time, accept the designation of the transmission time of day, and store the designated transmission time of day as reservation information in a storage unit; and a notifying unit configured to perform notification to a user in a case where the designated transmission time of day is included in the restraint period of time.