1. An image processing apparatus comprising: a plurality of processing units operable to share image processing; a memory unit operable to hold a parameter specifying an operation of each of said processing units; and a control unit operable to control said plurality of processing units, wherein said control unit includes: a sequence management unit operable to hold a sequence table indicating a sequence of activation of and completion of processing by each of said processing units, to activate each of said processing units according to the sequence table, and to confirm completion of processing by each of said processing units; and a parameter setting unit operable to hold a memory map indicating an address of a parameter for each of said processing units, and in advance of activation of each of said processing units by said sequence management unit, to read a parameter for said each processing unit to be activated, from said memory unit according to the memory map, and to set the parameter to said each processing unit according to the read result.