Patent ID: 7116432

Claim:
A print controlling apparatus for controlling a printing process for a printer main body by communicating with a data processing apparatus through a predetermined communication medium, said print controlling apparatus comprising: monitoring means for periodically monitoring a data receiving state from the data processing apparatus; discriminating means for discriminating whether an operating mode is a data standby mode or not from a periodical monitoring situation by said monitoring means; power control means for, when it is determined by said discriminating means that the operating mode is the data standby mode, stopping a fetch cycle for a memory, thereby shifting a power supplying mode for the printer main body excluding said monitoring means to a low-power supplying mode; and memory means for storing a flag showing that the low-power supplying mode by said power control means is being executed, wherein in the case where the flag showing that the low-power supplying mode is being executed has been stored in said memory means, said power control means periodically executes a predetermined driving for enabling the printer main body to start printing, and thereafter stops the fetch cycle for the memory, thereby shifting the power supplying mode to the low-power supplying mode.