Solid-state image pickup device and method for driving the same in a number of modes

A method for driving a solid-state image pickup device comprising a pixel array unit including unit pixels which are two-dimensionally arranged in a matrix pattern, each unit pixel including a photoelectric converter, and column signal lines corresponding to respective columns of the matrix pattern and a plurality of analog-digital converting units, each analog-digital converting unit being connected to a respective column signal line, the unit pixels being selectively controlled in units of rows, and the method comprising:

• converting analog signals output from the unit pixels in a row selected by the selective control through the column signal lines to digital signals via the analog-digital converting units,
• adding the digital signals among a plurality of unit pixels via the analog-digital converting units, and
• reading the added digital signals from the analog-digital converting units, wherein each unit pixel in the pixel array unit is selectively controlled in units of arbitrary rows, the analog-distal converting units being operable to performing the converting in a (a) normal-frame-rate mode and a (b) high-frame-rate mode in response to control signals.